PURPOSE: To prevent an uncontrolled steering phenomenon in a split μ road by steering front and rear wheels respectively in specific directions in accordance with a degree of drive torque difference between the right and left drive wheels, when a car speed is not more than a predetermined value further when a rotary speed difference between the right and left drive wheels is not less than a predetermined value.

CONSTITUTION: In an automobile, for instance, rear wheel-drive vehicle, pressure oil from an external hydraulic power source 30 is introduced to a power cylinder 27 through a control valve 39, thus right and left front wheels 24, 25 are steered independently of handle control action. The control valve 39 is controlled by a controller 33. Here the controller 33 provides respectively a car speed detecting part 331, drive wheel speed difference detecting part 332 and a drive torque difference detecting part 333 while a front wheel steering control part 334 controlling the control valve 39 in accordance with a detecting result of these detecting parts 331, 332, 333. When a car speed is not more than a predetermined value further when a rotary speed difference is not less than a predetermined value, in accordance with a degree of drive torque difference, for instance, each front wheel 24, 25 is steered in a direction of larger drive torque.