It is an object to improve starting performance in an engine rotational speed region that exceeds an idle rotation region without affecting normal traveling performance.At the time when a vehicle starts moving, when in an electronic control unit 2, the rotational speed of an engine 1 is in a predetermined range that exceeds an idle rotation region and the engine rotational speed decreases, the electronic control unit 2 adds a corrected fuel injection amount corresponding to the rate of decrease to a target fuel injection amount to create a new target fuel injection amount (S202 to S208), and when the rotational speed of the engine 1 increases, the electronic control unit subtracts a corrected fuel injection amount corresponding to the rate of increase of the engine rotational speed from a target fuel injection amount to create a new target fuel injection amount (S212 to S218), whereby control of the output of the engine 1 is performed by the electronic control unit 2.