In order to suppress misoperation of stability control resulting from neutral position displacement, between the steering input mechanism (St IN ) configured so that a steering shaft (12) rotates in accordance with the steering manipulation of the driver and a turning output mechanism (St OUT ) configured so that wheels are turned with the rotation of the pinion shaft (18), a clutch (19) is inserted that joins the steering shaft (12) and the pinion shaft (18) to be disconnectably. A first turning motor (M1) and a second turning motor (M2) are provided that can give a turning force to the turning output mechanism, and the first turning motor (M1) and the second turning motor (M2) are driven and controlled so that turning angle θw in accordance with the steering manipulation by the driver is realized while the clutch (19) is disconnected. When neutral position displacement occurs where the neutral position of the steering shaft (12) and the neutral position of the pinion shaft (18), the stability control is suppressed.