PURPOSE: To apply toe-in only at brake operation, improve the straight traveling performance, and improve fuel consumption, etc., by installing a variety of transmission devices including each pulse motor at the left and right in the middle part of a rod shaft for changing the steering angle of the front wheels of an automobile.

CONSTITUTION: At the middle part of a rod shaft 11 which is shifted in the lateral direction by the operation of a steering wheel 12 and steers the left and right front wheels 13, a variety of transmissions in pair at the left and right which consist of a worm gear train 5 revolved by a pulse motor 4, gear 6 for shift, etc., are installed. In the ordinary case, the vehicle is allowed to travel without generating a toe-in state, and the traveling performance of the vehicle and the fuel consumption are improved, while in braking, the pulse motor 4 is drive-controlled to establish the toe-in state, and the stable brake performance is secured.