To avoid the decline of the life of a battery under a low temperature or a low SOC while the output limit of the battery is suppressed to be as little as possible.

A DC power from a battery 10 is converted into an AC power by an inverter 14 and supplied to a motor 16. The larger the rate of the decline of the power, the larger the rate of the output limitation of the battery 10 is made by an EV-ECU 12. With this constitution, as the motor 16 is driven with a high output in a starting stage and the output limit value is increased with a lapse of time, the decline of the life of the battery 10 can be avoided while the output limit is suppressed to be as little as possible and the driving characteristics of the motor 16 are maintained.