A hybrid regulation controller stores a vehicle speed influence value set in accordance with a vehicle speed, a first threshold value of an accumulated value of the vehicle speed influence value, a second threshold value lower than the first threshold value and an engine start standard vehicle speed and momentarily accumulates the vehicle speed influence value (ST2) during an EV running period (ST1: YES). When the accumulated value is equal to or more than the first threshold value (ST7: YES) and when the accumulated value is equal to or more than the second threshold value (ST3: YES) and thevehicle speed becomes equal to or less than the engine start standard vehicle speed (ST4: YES), an engine is started.