The present invention is able to perform an examination of a motor mounted on EV or HEV (HV) as well as charge and discharge of a battery mounted on EV or HEV (HV), by a single system. The system includes a dynamometer 2 coupled to an output shaft 201 of a motor 200, a power supply unit 3 for supplying power to the motor 200 or the dynamometer 2, a motor examination circuit L1 for supplying the power of the power supply unit 3 to the dynamometer 2 and the motor 200, a battery charge and discharge circuit L2 connected with a battery 300, for supplying the power of the power supply unit 3 to the battery 300 or discharging the power of the battery 300, and a circuit switching mechanism 4 for switching between the motor examination circuit L1 and the battery charge and discharge circuit L2.