To bring actual driving force close to target driving force as much as possible while restraining an inertia torque loss during acceleration, when the abrupt acceleration is required.

When an internally dividing point (tNin) between the lowest target engine rotational speed and the highest target engine rotational speed is operated as a target engine rotational speed, an internal ratio of the point (tNin) is changed in response to an acceleration condition of a vehicle, wherein an engine rotational speed in an intersection point of a high-side target working line A for engine torque within a target working point range and an equal driving force line corresponding to the target driving force is used as the lowest target engine rotational speed, and wherein an engine rotational speed in an intersection point of a low-side target working line B for the engine torque within the target working point range and the equal driving force line corresponding to the target driving force is used as the highest target engine rotational speed.