next , although embodiments of an outdoor unit of an air conditioner of the present invention will be described with reference to drawings , the present invention is not limited thereto . as illustrated in fig1 to 4 , an outdoor unit 1 of an air conditioner includes a rectangular parallelepiped housing horizontally elongated in a lateral direction ( lateral direction in fig1 ). an interior of the housing 2 is partitioned into a machine chamber mc having a heat exchanger 3 and a compressor ( not illustrated ), and a blower chamber fc having a blower 4 . in the embodiment , the machine chamber mc is disposed at a lower portion in the housing 2 , and the blower chamber fc is disposed above the machine chamber mc . when viewing the lateral direction of the housing 2 in front surface in fig1 , a left half space of the machine chamber mc is defined as a left machine chamber ml , a right half space thereof is defined as a right machine chamber mr , a left half space of the blower chamber fc is defined as a left blower chamber fl , and a right half space of the blower chamber fc is defined as a right blower chamber fr . a first heat exchanger 3 l is disposed in the left machine chamber ml of the housing 2 , and a second heat exchanger 3 r is disposed in the right machine chamber mr . in addition , a first blower 4 l is disposed in the left blower chamber fl , a second blower 4 r is disposed in the right blower chamber fr , and a first air blowing port 11 l of the first blower 4 l and a second air blowing port 11 r of the second blower 4 r are respectively disposed on an upper surface of the housing 2 . the housing 2 is provided with a rectangular base panel 20 installed on the surface to be installed , a left side panel 30 l vertically disposed at a left side end of the base panel 20 , a right side panel 30 r vertically disposed at a right side end of the base panel 20 , a front beam 40 f ( refer to fig4 ) hung horizontally between a front end of the left side panel 30 l and a front end of the right side panel 30 r , and a rear beam 40 r ( refer to fig4 ) hung horizontally between a rear end of the left side panel 30 l and a rear end of the right side panel 30 r , as a basic structure . as illustrated in fig4 , the base panel 20 is formed by pressing or welding a steel plate , and is formed in a horizontally elongated rectangular shape . an engagement portion not illustrated in which a panel is screwed to the circumferential edge of the base panel 20 is substantially vertically disposed over the entire circumference . on the base panel 20 , a front leg 22 and a rear leg 23 are formed when the outdoor unit 1 is installed on the surface to be installed ( not illustrated ). the front leg 22 is bent substantially at right angle from a front end side ( front side in fig4 ) toward the lower side of the base panel 20 , and is formed continuously over the right and left . the rear leg 23 is bent substantially at right angle from a rear end side ( rear side in fig4 ) toward the lower side of the base panel 20 , and is formed continuously over both the right and left ends . referring to fig3 together , the heat exchanger 3 includes two heat exchanger units of a first heat exchanger 3 l and a second heat exchanger 3 r . the first heat exchanger 3 l includes a left front portion 31 l disposed along a left front end of the base panel 20 , a left side portion 32 l disposed along the left side end of the base panel 20 , and a left rear portion 33 l disposed along a left rear end of the base panel 20 , and is formed in a u - shape in a top view ( paper direction in fig3 ). the first heat exchanger 3 l is fixed to the base panel 20 via a first end plate 34 l ( hereinafter , also referred to as a front end portion 34 l ) attached to an end portion of the left front portion 31 l , and a second endplate 35 l ( hereinafter , also referred to as a rear end portion 35 l ) attached to an end portion of the left rear portion 33 l . the second heat exchanger 3 r includes a right front portion 31 r disposed along a right front end of the base panel 20 , a right side portion 32 r disposed along the right side end of the base panel 20 , and a right rear portion 33 r disposed along aright rear end of the base panel 20 , and is formed in a u - shape in a top view ( paper direction in fig3 ). the second heat exchanger 3 r is fixed to the base panel 20 via a third end plate 34 r ( hereinafter , also referred to as a front end portion 34 r ) attached to the end portion of the right front portion 31 r , and a fourth endplate 35 r ( hereinafter , also referred to as a rear end portion 35 r ) attached to the end portion of the right rear portion 33 r . referring back to fig1 to 4 , since basic shapes of the left side panel 30 l and the right side panel 30 r are the same as each other , and these panels are symmetrically disposed , hereinafter , a configuration of the left side panel 30 l will be described . the left side panel 30 l includes a press - formed metal plate , the width thereof is substantially the same as the length of a left end of the base panel 20 , and is formed in a vertically elongated rectangular shape extending from a lower end to an upper end of the housing 2 . the left side panel 30 l includes a pair of post portions 31 and 32 that engage with corner portions of the base panel 20 . a grille portion 33 that protects the left side portion 32 l of the first heat exchanger 3 l and a panel portion 34 that closes the right side surface of the blower chamber fc in fig2 are formed between the post portions 31 and 32 . since the lower ends of the post portions 31 and 32 are engaged with the side surfaces of the front leg 22 and the rear leg 23 of the base panel 20 , the lower ends thereof protrude from the lower end of the left side panel 30 l . in the grille portion 33 , a portion extending from the lower end to the upper end of the first heat exchanger 3 l is opened in a latticed shape . the first heat exchanger 3 l is adapted to be exposed to the outside via the grille portion 33 . the panel portion 34 is a panel surface which closes the right side surface of the blower chamber fc . referring to fig4 , the front beam 40 f includes an angle steel material having an l - shaped cross section in this example , and is horizontally hung between the post portion 31 of the left side panel 30 l and the post portion 31 of the right side panel 30 r . one end of the front beam 40 f is screwed to the post portion 31 on the front end side of the left side panel 30 l , and the other end thereof is screwed to the post portion 31 on the front end side of the right side panel 30 r . the rear beam 40 r includes an angle steel material similarly having an l - shaped cross section , and is horizontally hung between the post portion 32 of the left side panel 30 l and the post portion 32 of the right side panel 30 r . one end of the rear beam 40 r is screwed to the post portion 32 on the rear end side of the left side panel 30 l , and the other end thereof is screwed to the post portion 32 on the rear end side of the right side panel 30 r . in the embodiment , the front beam 40 f and the rear beam 40 r are disposed along a boundary between the machine chamber mc and the blower chamber fc of the housing 2 . the front beam 40 f and the rear beam 40 r are disposed on the same plane so as to be parallel to each other and parallel to the base panel 20 . a first motor bracket 41 l that mounts the first blower 4 l and a second motor bracket 41 r that mounts the second blower 4 r are disposed between the front beam 40 f and the rear beam 40 r . in the embodiment , the first motor bracket 41 l is disposed in the left blower chamber fl , and the second motor bracket 41 r is disposed in the right blower chamber fr . since the first motor bracket 41 l and the second motor bracket 41 r have the same configuration , hereinafter , the first motor bracket 41 l will be described . the first motor bracket 41 l includes a pair of beam members 411 and 411 hung in parallel between the front beam 40 f and the rear beam 40 r , and both ends of the beam members 411 and 411 are respectively screwed and fixed to the front beam 40 f and the rear beam 40 r . a fan motor m of the blower 4 l is mounted on the first motor bracket 41 l , and a blower fan ( not illustrated ) is attached to a rotation shaft ol of the fan motor m . similarly , a fan motor m of the blower 4 r is mounted on the second motor bracket 41 r , and a blower fan ( not illustrated ) is attached to a rotation shaft or of the fan motor m . a cylindrical bell mouth bm ( bml and bmr , refer to fig5 a and 5b ) is disposed on an outer circumference of each of the blowers 4 ( 4 l and 4 r ). in the embodiment , the air blowing ports 11 ( 11 l and 11 r ) correspond to the inner diameter ( φ 1 in fig5 b ) of the bell mouth bm . in fig5 a and 5b , the position of the outline of the bell mouth bm is illustrated by a dashed line . in the embodiment , the bell mouth bm is formed so that the opening diameter of the air blowing port 11 gradually decreases as going from the lower end ( lower end in fig5 b ) to the upper end ( upper end in fig5 b ) in the axial direction . according to this configuration , as the blower 4 is driven , the air that is passed through the heat exchangers 3 l and 3 r from the outside surface of the housing 2 and is heat - exchanged is discharged from the air blowing port 11 to the outside of the housing 2 via the blower 4 . additionally , in a case where two blowers 4 l and 4 r are mounted on the front beam 40 f and the rear beam 40 r , the bending moment increases from the both ends toward the center to the front beam 40 f and the rear beam 40 r , and there is a possibility of distortion or bending to occur in the front beam 40 f and the rear beam 40 r . therefore , in order to increase mechanical strength of the front beam 40 f and the rear beam 40 r , a front pillar 50 and a rear pillar 60 are disposed in the housing 2 . the front pillar 50 is provided with a left front pillar 50 l disposed at a front surface side of the left machine chamber ml , and a right front pillar 50 r disposed at a front surface side of the right machine chamber mr . next , although a configuration of each of the front pillars 50 l and 50 r is described , since the basic configurations of the front pillars 50 l and 50 r are the same as each other , and have a symmetrical shape , the left front pillar 50 l will be described . the left front pillar 50 l includes , for example , a single press - formed steel plate , and is formed in a vertically elongated rectangular shape . the left front pillar 50 l is provided with the grille portion 51 that protects the left front portion 31 l of the first heat exchanger 3 l . in the embodiment , the grille portion 51 is formed in a latticed shape in which eight through holes 511 cut out squarely are disposed . a first flange portion 52 for screwing the left front pillar 50 l to the post portion 31 of the left side panel 30 l is disposed at the left end of the left front pillar 50 l . a second flange portion 53 to which service panels 70 a and 70 b and an electric component box 80 described later are attached is disposed at a right end of the left front pillar 50 l . a third flange portion 54 for screwing to the front beam 40 f is further disposed on the upper end of the left front pillar 50 l . a lower end side of the left front pillar 50 l is screwed to the base panel 20 , and the upper end side of the left front pillar 50 l is screwed to the front beam 40 f via the third flange portion 54 , and the left front pillar 50 l is further screwed in a state in which the first flange portion 52 abuts on the post portion 31 of the left side panel 40 l . as illustrated in fig2 , the rear pillar 60 includes , for example , a press - formed steel plate , and is formed in a vertically elongated rectangular shape in which the lower end thereof is fixed to the base panel 20 , and the upper end thereof is fixed to the rear beam 40 r . the rear pillar 60 is provided with a panel body 61 on the center , that closes a rear opening portion 2 b existing between the first heat exchanger 3 l and the second heat exchanger 3 r . the first flange portion 62 screwed to an end plate 35 l of the first heat exchanger 3 l is formed at the right end of the rear pillar 60 in fig2 . the second flange portion 63 screwed to the end plate 35 r of the second heat exchanger 3 r is formed at the left end of the rear pillar 60 in fig2 . the upper end of the rear pillar 60 is screwed to the rear beam 40 r . the lower end of the rear pillar 60 is screwed to the base panel 20 , and the upper end of the rear pillar 60 is screwed to the rear beam 40 r , and the first flange portion 62 is screwed to the end plate 35 l of the first heat exchanger 3 l , and the second flange portion 63 is screwed to the end plate 35 r of the second heat exchanger 3 r . thereby , as illustrated in fig2 , it is possible to close the rear opening portion 2 b existing between the first heat exchanger 3 l and the second heat exchanger 3 r with the rear pillar 60 . according to this , the two front pillars 50 l and 50 r are screwed between the base panel 20 and the front beam 40 f and the rear pillar 60 is locked between the base panel 20 and the rear beam 40 r . therefore , the mechanical strength of the housing 2 is increased , and deformation and bending of the housing 2 can be prevented . although a protection grille ( not illustrated ) for protecting rear portions 33 l and 33 r of the first and second heat exchangers 3 l and 3 r is screwed between the rear pillar 60 and the right and left side panels 50 r and 50 l , since a description is particularly not required in the present invention , the description thereof will be omitted . referring to fig1 to 4 , the space between the left front pillar 50 l and the right front pillar 50 r of the housing 2 is a front opening portion 2 a ( refer to fig4 ) for maintenance . accordingly , the service panel 70 is attached to the front opening portion 2 a . the service panel 70 includes two panel materials having an upper service panel 70 a that closes an upper side of the front opening portion 2 a , and a lower service panel 70 b that closes a lower side of the front opening portion 2 a . the upper service panel 70 a and the lower service panel 70 b include substantially square metal panels . the left end of the upper service panel 70 a and the lower service panel 70 b ( left end in fig1 ) is screwed to the second flange portion 53 of the left front pillar 50 l . the right end of the upper service panel 70 a and the lower service panel 70 b ( right end in fig1 ) is screwed to the second flange portion 53 of the right front pillar 50 r . in the embodiment , the lower left corner of the lower service panel 70 b is cut in an l - shape , and a conduit panel 74 for connecting a conduit pipe ( not illustrated ) is fitted in a cutout portion 73 thereof . as illustrated in fig3 , the electric component box 80 is disposed on a rear surface ( surface facing the inside of the housing 2 ) of the upper service panel 70 a . the electric component box 80 includes a rectangular parallelepiped box substantially equal in size to the upper service panel 70 a and is screwed to the second flange portions 53 and 53 of the right and left front pillars 50 r and 50 l . the front panel 90 f is disposed at a front surface side ( front surface side in fig1 ) of the blower chamber fc , and a rear panel 90 r is disposed at a rear surface side ( front surface side in fig2 ) of the blower chamber fc of the housing 2 . both the front panel 90 f and the rear panel 90 r are horizontally elongated rectangular metal panels covering the front surface side and the rear surface side of the blower chamber fc , and are respectively screwed to the side panels 30 l and 30 r . a top panel 91 is attached to a top surface of the blower chamber fc . a top panel 91 includes a horizontally elongated rectangular metal frame covering the upper surface of the housing 2 . a rectangular first opening portion 92 l exposing the first air blowing port 11 l and a square second opening portion 92 r exposing the second air blowing port 11 r are formed on the top panel 91 . in the embodiment , reinforcing beam portions 94 are formed between each of the opening portions 92 l and 92 r . the protection grilles 93 r and 93 l are respectively screwed to each of the right and left opening portions 92 r and 92 l with the beam portion 94 interposed therebetween . the feature of the present invention is that without enlarging the blower 4 along with increasing the size of the housing 2 and the heat exchanger 3 , the layout thereof is reviewed and the heat exchange capacity of the outdoor unit is enhanced without enlarging the blower . therefore , referring to fig5 a and 5b , the center line in the lateral direction ( lateral direction in fig5 a and 5b ) of the left blower chamber fl is defined as ll , and the center line in the lateral direction ( lateral direction in fig5 a and 5b ) of the right blower chamber fr is defined as lr . the rotation shaft ol of the first blower 4 l is disposed closer to the center line l in the lateral direction of the housing 2 ( rightward in fig5 a and 5b ) than the center line ll in the lateral direction of the left blower chamber fl . the rotation shaft or of the second blower 4 r is disposed closer to the center line l in the lateral direction of the housing 2 ( leftward in fig5 a and 5b ) than the center line lr in the lateral direction of the right blower chamber fr . as a more preferred aspect , when the distance between the center line l and the outer circumference of the first air blowing port 11 l or the second air blowing port 11 is defined as g 1 , the distance between a side panel 30 l of the housing 2 and the outer circumference of the first air blowing port 11 l , or the distance between a side panel 30 r thereof and the outer circumference of the second air blowing port 11 r is defined as g 2 , the air blowing port 11 is disposed at a position that satisfies g 1 & lt ; g 2 . as a further preferred aspect , when the inner diameter of the bell mouth bm is defined as φ 1 , and the outer diameter of the bell mouth bm is defined as φ 2 , the distance g 1 is disposed so as to satisfy g 1 ≧( φ 2 − φ 1 )/ 2 . according to this configuration , each of the air blowing ports 11 l and 11 r is disposed closer toward the center line l in the minimum range within which the bell mouth bm can be configured . therefore , the amount of air passing through the heat exchanger at the same rotation speed increases . accordingly , it is possible to enhance the heat exchange capacity of the outdoor unit without enlarging the blower . in addition , it is possible to reduce the current consumption of the motor for obtaining the same amount of air , and to enhance the operation efficiency of the outdoor unit , without enlarging the blower . next , the simulation result calculated based on the more specific specification of the present invention will be considered together with the comparative example . the specification of the each housing in the application example and the comparative example is illustrated in fig6 a and 6b . both the sizes ( width w × depth d × height h = 1750 mm × 765 mm × 1690 mm ) of the housing 2 are the same . ( 2 ) a rotation speed of each of the right and left blower fans is 940 rpm . ( 3 ) the resistance to ventilation of the heat exchanger is defined as a coefficient based on measured value . ( 4 ) the pressure boundary is 0 pa other than the floor surface . ( 5 ) the air physical property value is set to a density of 1 . 18415 kg / m 3 and a viscosity coefficient of 1 . 85508 × 10 − 5 pa · s . the amount of air of the air intake surface and the axial power of each of the blower fans at each of the above physical property values are calculated and the wind velocity distribution ( m / s ) on the heat exchanger surface is illustrated in the contour diagram ( fig7 ). in addition , the flow of air from the suction to the blowout in the interior of the housing is illustrated by a trace line ( fig8 ). hereinafter , specification values ( simulation ) of the housing in the application example and the comparative example are described . hereinafter , fig7 and 8 illustrate the simulation results . according to this , as illustrated in fig7 , it is understood that the air flow at the front and rear portions of the bottom portion of the housing 2 ( area surrounded by the broken line ) in the application example in the region where the flow velocity is fast ( portion of the light color ) is increased as compared with that in the comparative example . furthermore , as illustrated in fig8 , the air flow of the bottom portion of the housing 2 ( area surrounded by the broken line ) on the lower side in the comparative example is rough , whereas the air in the application example is dense and it is understood that the air flow is large . according to this , the simulation result is obtained that the amount of air passing through the heat exchanger at the same rotation speed increased by approximately 2 %. as described above , according to the embodiment of the present invention , the air blowing port of the first blower and the air blowing port of the second blower are disposed close to each other in a possible range with the center line l in the lateral direction of the housing interposed therebetween . therefore , it is possible to effectively utilize the wind of the blower which is conventionally wasted . as a result , since the amount of air and the wind velocity distribution per unit area passing through the heat exchanger at the same rotation speed increase , it is possible to enhance the heat exchange capacity of the outdoor unit , without enlarging the blower . in addition , it is possible to reduce the current consumption of the motor for obtaining the same amount of air , and to enhance the operation efficiency of the outdoor unit , without enlarging the blower .