A front fork (1) includes: a fork main body (2) that includes a tube member (3) including a vehicle body side tube (3a) and an axle side tube (3b), and a suspension spring (4) that biases the tube member (3) in a stretching direction; a cap (5) that includes a cylindrical portion (5a) and a lid portion (5b) continuing to the outer circumference of the cylindrical portion (5a), and closes the opening end of the vehicle body side tube (3a); a washer (6) that supports the upper end of the suspension spring (4); an adjuster (7) that includes a shaft portion (7a) screwed to the washer (6), a flange portion (7b) provided at the rear end of the shaft portion (7a), and an operation shaft portion 7c extending from an opposite shaft portion side of the flange portion (7b), and that is rotatably inserted into the cylindrical portion 5a; and a stopper member (8) that is placed on the inner circumference of the cylindrical portion (5a) and prevents the adjuster (7) from being detached from the cap (5).