To effectively obtain the regenerative energy by providing a mechanism to accelerate the rotation speed on the drive wheel side at regeneration, even when a motor generator is in a region of low rotation speed, with a normally poor motor efficiency.

The hybrid vehicle is provided with the motor generator (3) and a driving control means (22) for selectively deciding a driving state whether the motor generator (3) is made to function as a motor or as a generator corresponding to a vehicular condition, and when the driving control means decides to use the motor generator as a motor, the driving force of the motor generator (3) is transmitted to the driving shaft (10) to travel the vehicle. The hybrid vehicle is also provided with an accelerating mechanisms (5, 22) for accelerating the rotation speed on the driving shaft (10) side to transmit the accelerated rotation speed to the motor generator (3), when a driving control means decides to use the motor generator (3) as a generator.