To improve practicality of a suspension system for a vehicle provided with a roll suppressing device such as a stabilizer device.

A target rotary angle θ* of an actuator of the roll suppressing device is decided (S26, 27, 28) based on actual lateral acceleration G and estimated lateral acceleration G when steering speed is fast (S22), estimated lateral acceleration is large (S23), and a deviation of actual lateral acceleration and estimated lateral acceleration is large (S24). When codes of the actual lateral acceleration G and the estimated lateral acceleration G are different, when the actual lateral acceleration G is large, and when a turn-back of a steering operation is performed for a short time (S30, 31), in even this case, a control based on both of the lateral acceleration G is inhibited and a control based on the actual lateral acceleration G is executed (S19, 20, 21).