A shock absorber includes a telescopic tube member configured to include a vehicle body side tube and a vehicle wheel side tube, a cap member that closes an upper side opening of the vehicle body side tube, a cylinder erected in an axial center portion of the vehicle wheel side tube, a piston rod held by the cap member and configured to enter and exit the cylinder, a reservoir formed between the tube member and the cylinder, a cap interior passage formed in the cap member and configured to connect the rod interior passage to the reservoir, a plurality of valve bodies provided in series or in parallel midway in the cap interior passage, and a plurality of adjusters attached to the cap member and configured to be capable of adjusting a valve opening pressure or an opening amount of the plurality of valve bodies.