one embodiment of the speedometer mounting structure according to the present embodiment will be described with reference to the accompanying drawings . in fig1 reference numeral 10 refers to a motorcycle to which the present embodiment is applied . the motorcycle 10 includes a vehicle body frame 11 , a front fork 12 arranged at the front of the vehicle body frame 11 , and a front wheel 13 rotatably mounted at the lower end of the front fork 12 . a steering handlebar 14 is mounted at the upper end of the front fork 12 . a rear fork 15 is pivotably mounted at the lower rear part of the vehicle body frame 11 , and a rear wheel 16 is rotatably mounted on the rocking end of the rear fork 15 . a fuel tank 17 is mounted at the rear position of the steering handlebar 14 , in the upper part of the vehicle body frame 11 . a seat 18 is mounted to the rear of the fuel tank 17 , and an engine 19 is mounted below the fuel tank 17 . the front fork 12 is vertically arranged under the head pipe 20 constituting the front part of the vehicle body frame 11 , and is connected to a pair of bridges 21 , upper and lower , which are rotatably connected to the head pipe 20 . in the present embodiment , the pair of bridges 21 serve as a fork support member for rotatably connecting the front fork 12 to the vehicle body frame 11 . on the bridges 21 located in the upper part of the vehicle body frame , a handlebar holder 22 is integrally mounted for securing the steering handlebar 13 . in the present embodiment , the handlebar holder 22 , as shown in fig2 and 3 , is split into two upper and lower parts : an upper holder 23 and a lower holder 24 , which , as shown in fig3 are attached on the bridges 21 in two places apart in the width direction of the vehicle body . each lower holder 24 is provided , in the lower part , with a pair of connecting bolts 25 , which are unitarily projectingly formed therewith . each connecting bolt 25 is inserted from above into the bridge 21 , and is fitted with a nut 26 from below the bridge 21 , thereby securing each lower holder 24 to the bridge 21 . the upper holder 23 , as shown in fig3 is mounted across the upper ends of the lower holders 24 . bolts 27 inserted vertically into the upper holder 23 are screwed into the lower holders 24 , thereby fixedly attaching the upper holder 23 to the lower holders 24 . recesses 23 a and 24 a are formed in the contact surfaces of the upper holder 23 and the lower holders 24 . the recesses 23 a and 24 a have an approximately semi - circular inner surface . the steering handlebar 14 is set in a space formed by the recesses 23 a and 24 a , and is fixedly held in between the upper holder 23 and the lower holders 24 . a housing box 28 is formed in about the middle of the upper holder 23 which opens upwardly . a speedometer 29 is mounted in the housing box 28 . the speedometer 29 has a cylindrical projection 30 integrally formed with the bottom thereof which serves as a cable guide , and a screw portion 30 a is formed in the forward end portion thereof . the projection 30 goes through the bottom of the housing box 28 , projecting downwardly , when the speedometer 29 is installed in the housing box 28 . a nut 31 is threaded onto the screw portion 30 a formed at the forward end thereof , and is pressed against the underside of the housing box 28 to thereby fix the speedometer 29 in the housing box 28 . in the present embodiment of the speedometer mounting structure thus configured , the speedometer 29 is inserted into the housing box 28 of the upper holder 23 , the screw portion 30 a is protruded out of the bottom of the housing box 28 , and the nut 31 is screwed onto the screw portion 30 a , to thereby temporarily assemble the speedometer 29 in the upper holder 23 . therefore , after mounting the steering handlebar 14 between both lower holders 24 attached on the bridge 21 , the upper holder 23 is set to cover the steering handlebar 14 , and the upper holder 23 is secured by the bolts 27 to the lower holders 24 . the steering handlebar 14 is thus fixedly installed by the above - described operation procedure , and the speedometer 29 is mounted above about the intermediate part of the steering handlebar 14 . the speedometer 29 , therefore , is mounted largely apart from the headlight 32 mounted ahead of the front fork 12 as shown in fig1 thereby gaining a design effect by the headlight 32 . the speedometer 29 , being mounted in the space surrounded by the steering handlebar 14 to the rear of the front fork 12 , becomes smooth in the outside line as viewed from the side of the motorcycle 10 . in this respect also , the design effect is enhanced . furthermore , the housing box 28 is formed in the handlebar holder 22 , to thereby mount the speedometer 29 in the housing box 28 . the handlebar holder 22 is herein also used as a mounting member , so that the number of components required for mounting the speedometer 29 can be decreased and accordingly an installing operation can be simplified . it is to be noted that the shape and dimensions of component members shown in the present embodiments are described as examples , and various modifications based on design requirements are possible . according to the speedometer mounting structure in a motorcycle of the present invention , as heretofore explained , the speedometer is mounted on the handlebar holder , in a position largely apart from the headlight mounted ahead of the front fork , thereby enabling a gain in the design effect of the speedometer mounting structure in relation to the headlight . since the speedometer can be mounted to the rear of the front fork , and in the space surrounded by the steering handlebar , the outline of the speedometer mounting structure becomes smooth , which enhances the design effect from this point of view . furthermore , the housing box is formed in the handlebar holder , to thereby mount the speedometer in the housing box . the handlebar holder is used as a mounting member , so that the number of components required for mounting the speedometer can be decreased and accordingly an installing operation can be simplified . the invention being thus described , it will be obvious that the same may be varied in many ways . such variations are not to be regarded as a departure from the spirit and scope of the invention , and all such modifications as would be obvious to one skilled in the art are to be included within the scope of the following claims .