To ensure ride comfort and traveling performance, without impairment of wide flexibility in a motor installing position that is a merit of motor driving.

A motor 4 is attached to a vehicle body 1, and an output shaft 4a of the motor 4 and a hub shaft 3 of each wheel 2 are coupled by a driving force transmitting device wherein a tri-port type constant velocity universal joint 5 forming a shock absorbing mechanism is interposed. Supporting mechanisms for receiving an axial load loaded on the shock absorbing mechanism are provided on the motor 4 on a driving force transmitting side and the constant velocity universal joint 6 coupled to a driving force transmitted side. Therefore, ride comfort and traveling performance is ensured without impairment of the wide flexibility in the motor installing position that is a merit of motor driving.