A charge/discharge system equipped with a first and a second charging device for supplying power to a motor generator, and charging using the power generated by the motor generator, a power conversion device for charging and discharging power between the first and second charging devices, and a control device, wherein the control device controls the power conversion device so as to charge the second charging device using the power stored in the first charging device, or charge the first charging device using the power stored in the second charging device, on the basis of the state of charge of the first and second charging devices.