A controller includes a SOC prediction unit to predict a SOC, based on a predicted result of a road grade and a vehicle speed in a scheduled travel route, and a discharge control unit to execute a discharge increasing control to previously increase a discharge quantity of the battery to prevent the battery from becoming in a saturation state based on a predicted SOC, when the battery becomes in the saturation state. The discharge control unit includes a first mode to execute an assist discharge increasing control in an assist travel, and a second mode to execute an EV discharge increasing control by decreasing the vehicle speed and by increasing an opportunity of an EV travel, as the discharge increasing control. When the EV discharge increasing control can be executed, the EV discharge increasing control is executed with priority relative to the assist discharge increasing control.