To enable the fixing space for a fuel tank or the like to be secured and at the same time restrict an unsprung weight of a suspension from being increased and keep a riding comfortable state of a driver in a superior state.

A first link mechanism 8 of a suspension 7 for use in connecting a driving wheel 3 to a vehicle body 2 is arranged at a rear side of a vehicle 1. The driving wheel 3 moves up and down against the vehicle body 2 through the first link mechanism 8. Additionally, a shock absorber 9 for elastically supporting the driving wheel 3 against the vehicle body 2 is fixed to a lower arm 8B of the first link mechanism 8. Further, the upper arm 8A and the lower arm 8B of the first link mechanism 8 are provided with a second link mechanism 10 for performing a moving-up or moving-down operation symmetrically to the moving-up or moving-down operation of the first link mechanism 8. A motor 14 is integrally arranged at the second link mechanism 10. Thus, an inertia energy generated by the moving-up or moving-down operation of the driving wheel 3 and an inertia energy generated by the moving-up or moving-down operation of a motor 14 are offset by each other.