To provide an adjustable damper capable of restricting power consumption to the minimum to prevent the damper from bottoming.

In the case of preventing bottoming by increasing damping force of the damper when damper displacement caused with bump or rebound of a suspension device exceeds the predetermined value A, increase of the damping force is inhibited when car speed is 5 km/h or less. Even in the case wherein damper displacement exceeds the predetermined value A because a load on the vehicle is large, wasted power consumption can be prevented to increase damping force of the damper when travelling at low speed (comprising a stop) without a risk that bottoming occurs.