A charging state estimation unit estimates a remaining capacity of a power storage device. A charge/discharge control unit controls charging and discharging of the power storage device based on the remaining capacity estimate value. The charge/discharge control unit includes a charge instruction unit for, in the case where the remaining capacity estimate value falls below a predetermined lower limit value, controlling the internal combustion engine to be in the load operation state to generate charge power and controlling the internal combustion engine to be in the no-load operation state when it is determined that a prescribed charge termination condition is satisfied. The charge instruction unit sets the charge termination condition such that the charging time for the power storage device is shortened as the charge power that can be received by the power storage device in the present state is decreased.