To provide a shock-absorber for a vehicle provided with front wheel dampers and rear wheel dampers capable of changing damping coefficient of the front wheel dampers and the rear wheel dampers without consuming energy with a simple structure, capable of improving ride and travelling stability of a vehicle with a foreseeing function on the rear wheel damper.

A front hydraulic damper 2 provided between a front wheel 6 and a body 9 of a vehicle C and a rear hydraulic damper 3 provided between a rear wheel 7 and the body 9 are provided with a first communicating tube 4 carrying out communication between a wheel side hydraulic chamber 21a of the front hydraulic damper 2 and a body side hydraulic chamber 31b of the rear hydraulic damper 3, and a second communicating tube 5 carrying out communication between a body side hydraulic chamber 21b of the front hydraulic damper 2 and a wheel side hydraulic chamber 31a of the rear hydraulic damper 3.