To enhance the energy efficiency in a power supply, when a motor included in the power supply is driven by a predetermined drive operation, such as operation accompanying abrupt changes in the rotational speed and the output torque.

If a motor MG2 is driven by the drive operation with an output torque limited by a torque-limiting value Tlim when a vehicle motion integration control is implemented so as to maintain a position, while a vehicle turns and inhibit slippages due to idle running of wheels (S210), or if the driving wheels are slipped, when the vehicle motion integration control is not implemented (S260); a voltage-boosting converter 55 is controlled so as to set a boosted voltage VH to a voltage or higher, corresponding to a boost voltage instruction VH* as a previous boost voltage instruction, set immediately prior to the input of the torque-limiting value Tlim for indicating a request for driving the motor MG2 by the drive operation with the limited output torque.