SUSPENSION DEVICE

A suspension device (S) of the present invention includes: a member (11) coupled to one of a vehicle body and a vehicle axle; an outer cylinder (3) coupled to the other one of the vehicle body and the vehicle axle and disposed at the outer circumference of the member (11); and a bearing (4) that is interposed between the member (11) and the outer cylinder (3), the bearing (4) having balls (4a) that rollably contact at least one of the member (11) and the outer cylinder (3), and a ball case (4b) that retains the balls (4a) rollably.