PURPOSE: To suppress rolling of a car body small even when turning perfor mance of a vehicle is improved.

CONSTITUTION: A front wheel steering angle θf, yaw rate θ and a car speed V are respectively detected by a front wheel steering angle sensor 31, yaw rate sensor 33 and a car speed sensor 34. A microcomputer 35 controls a rear wheel steered by calculating a target rear wheel steering angle θr* based on the front wheel steering angle θf, yaw rate γ and the car speed V. Here on condition that a traction control unit 40 is inoperative further with a suspension characteristic set to a hard condition by a suspension control unit 50, the target rear wheel steering angle θr* is corrected to a reverse phase side relating to steering a front wheel by a correction amount increased in accordance with increasing an absolute value dθf/dt of a front wheel steering speed dθf/dt. In this way, only when the suspension characteristic is placed in a hard condition with traction inoperative, the target rear wheel steering angle θr* is corrected to a side of attaching importance to drivability, to suppress a car body from its roll even when turning performance of a vehicle is improved.