VEHICLE SUSPENSION SYSTEM

A vehicle suspension system (100) includes a shock absorber (1) having a cylinder (2) in which a fluid is sealed, a piston (11) slidably fitted into the cylinder (2), a piston rod (3) connected to the piston (11) and extending to an outside of the cylinder (2) and a damping force generating apparatus (40) controlling a flow of the fluid generated by a sliding motion of the piston (11) inside the cylinder (2), a suspension spring (27), a detector (110) detecting a stroke position of the piston rod (3) with respect to the cylinder (2) and a controller (101) controlling the damping force generating apparatus (40) so that one of an extension side damping force and a compression side damping force is increased and other of them is reduced in proportion to the stroke position detected by the detector (110).