Patent ID: 8469370

Claim:
A suspension device, comprising: an actuator comprising a motion conversion mechanism converting linear motion into rotational motion and a motor coupled to a rotational member of the motion conversion mechanism exhibiting rotational motion; and a fluid pressure damper having a rod and a damper main body into which the rod moves in and out, one of the rod and the damper main body of the fluid pressure damper being coupled to a linear motion member of the motion conversion mechanism exhibiting linear motion; an outer cylinder connected to the fluid pressure damper; an air chamber forming an air spring sectioned by an air chamber member provided at an outer circumference of the actuator, the outer cylinder, and a diaphragm bridged between the air chamber member and the outer cylinder, wherein the outer cylinder functions as an air piston of the air spring; a bearing interposed between the actuator and the outer cylinder, the bearing having a ball rollably contacting at least one of the actuator and the outer cylinder, and a ball case that retains the ball rollably, wherein a groove in which the ball travels is provided to one of the actuator and the outer cylinder on which the ball rolls so as to guide travel of the ball.