A front fork includes a damper that generates a damping force, a cylinder body that houses the damper, a reservoir formed on an exterior of the cylinder body, a rod body that is inserted into the cylinder body to be capable of advancing and retreating, a piston portion that defines an upper chamber and a lower chamber within the cylinder body, a through hole allows a working fluid to flow from the cylinder body into the reservoir, a flow rate control mechanism that is disposed in the vehicle body side tube to face an upper end opening of the through hole, and applies a resistance to a flow of the working fluid flowing toward the reservoir from the rod body, and a driving mechanism that drives the flow rate control mechanism to adjust an expansion side damping force and a contraction side damping force generated by the damper.