A management ECU of a control unit predicts the reduction degree of a system voltage according to an operational state of a motor based on the temperature of a fuel cell and a number of rotations of the motor, sets motor output restriction start voltage and motor output restriction end voltage which are threshold values of the system voltage for triggering an execution start and an execution end of a processing to restrict an output of the motor, and outputs them to a motor ECU. The motor ECU sets an output restriction coefficient that is a restriction rate in restricting the output of the motor based on a detected value of the system voltage and the motor output restriction start voltage and the motor output restriction end voltage, and restricts the output of the motor.