a main portion, at least one connecting portion and an elbow portion defined as a portion between the main portion and the connecting portion thereof, the connecting portion of the second wiring and the connecting portion of the fourth wiring being in contact with each other through a predetermined area. Between any one of the first wiring to the fourth wiring and one of the other wirings, a specific distance defined as a distance between gravity centers in sections of two corresponding wirings of the first wiring to the fourth wiring cut along a plane vertical to each main face of the two corresponding wirings is less than the predetermined plate width of each of the two corresponding wirings. The main portion of the first wiring and theas a narrow plate having two main faces and having a predetermined plate width, and provided with a main portion, at least one connecting portion and an elbow portion defined as a portion between the main portion and the connecting portion thereof; a second wiring that extends as a narrow plate having two main faces and having a predetermined plate width, and provided with a main portion, at least one connecting portion and an elbow portion defined as a portion between the main portion and the connecting portion thereof; a third wiring that extends as a narrow plate having two main faces and having a predetermined plate width, and provided with a main portion, at least one connecting portion and an elbow portion defined as a portion between