A method for controlling a state of charge of an electric power storage device for a motor-driven vehicle without a reverse gear includes providing a plurality of driving sources but does not include a reverse gear and implements backward driving of the vehicle by reversely driving a motor as one of the driving sources, and further includes determining whether or not backward uphill driving is necessary, monitoring the state of charge of the electric power storage device when it is determined that the backward uphill driving is necessary, and controlling the state of charge of the electric power storage device based on the monitored state of charge of the electric power storage device.