Vehicle suspension device

A vehicle suspension device comprising: first and second hydraulic dampers, a pressure regulator connected to the first and second hydraulic dampers, wherein a sub-piston is provided in each of the first and second hydraulic dampers, said sub-piston is inserted in a hydraulic chamber and relatively moveable within said hydraulic chamber in accordance with the relative movement between a cylinder and said piston of each damper, and wherein said hydraulic chambers are connected to the pressure regulator.