A variable damping force member is used in a vehicle suspension device and the damping force of which can be changed. The variable damping force member is equipped with a piston which is slidably housed in a cylinder filled with a fluid and which divides the cylinder into a first fluid chamber and a second fluid chamber, and has fluid passages connecting the first and second fluid passages. A valve member is provided in the piston for blocking the fluid passages, and for opening the fluid passages when the piston slides. A piezoelectric body is connected to the valve member, and pushes the valve member towards the fluid passages when voltage is applied. A bellows is arranged on the valve member so as to seal the piezoelectric body from the fluid, and the bellows biases the piston in the direction in which the piezoelectric body is constricted.