In order to ensure the amount of power required for a process after stopping of a vehicle, and to perform the process smoothly after stopping of the vehicle, a stopping control circuit controls stopping of an engine. The engine causes an alternator to rotate. The alternator charges a power storage device. The stopping control circuit is equipped with an instruction unit that outputs a stopping instruction signal for instructing the engine to stop, and an electronic control unit. After a stopping instruction signal is received and the amount of power stored in the power storage device reaches aprescribed value, the electronic control unit outputs to the engine a stopping signal for stopping the engine rotation.