A shock absorber (1, 2), comprising: a hollow rod; a suspension spring arranged outside the hollow rod; a spring receiver (42, 44) arranged to be displaceable with respect to the hollow rod and receiving a load of the suspension spring; an adjusting screw inserted into one end side of the hollow rod and configured to adjust a position of the suspension spring by restricting movement of the spring receiver (42, 44) to the one end side; and a shaft member which transmits a load received by the spring receiver (42, 44) to the adjusting screw inside the hollow rod, wherein an insertion portion (34, 35) which extends in an axial direction of the hollow rod and into which the shaft member is inserted is provided on a side surface of the hollow rod, a cylinder arranged outside the suspension spring, characterized in that the shock absorber further comprises: a cap member which is disposed in an opening portion on one end side of the cylinder and into which the hollow rod is inserted; and a nut configured to fix the hollow rod to the cap member, wherein the nut is arranged closer to one end side than the spring receiver (42, 44), wherein the adjusting screw is inserted coaxially with the hollow rod at the one end portion of the hollow rod, wherein screw grooves formed on the outer peripheral surface of the adjusting screw and the inner peripheral surface of the hollow rod are screwed together, so that by rotating the adjusting screw, the adjusting screw can be moved up and down, whereby the shaft member and the spring receiver can be moved up and down. a hollow rod; a suspension spring arranged outside the hollow rod; a spring receiver (42, 44) arranged to be displaceable with respect to the hollow rod and receiving a load of the suspension spring; an adjusting screw inserted into one end side of the hollow rod and configured to adjust a position of the suspension spring by restricting movement of the spring receiver (42, 44) to the one end side; and a shaft member which transmits a load received by the spring receiver (42, 44) to the adjusting screw inside the hollow rod, wherein an insertion portion (34, 35) which extends in an axial direction of the hollow rod and into which the shaft member is inserted is provided on a side surface of the hollow rod, a cylinder arranged outside the suspension spring, characterized in that the shock absorber further comprises: a cap member which is disposed in an opening portion on one end side of the cylinder and into which the hollow rod is inserted; and a nut configured to fix the hollow rod to the cap member, wherein the nut is arranged closer to one end side than the spring receiver (42, 44), wherein the adjusting screw is inserted coaxially with the hollow rod at the one end portion of the hollow rod, wherein screw grooves formed on the outer peripheral surface of the adjusting screw and the inner peripheral surface of the hollow rod are screwed together, so that by rotating the adjusting screw, the adjusting screw can be moved up and down, whereby the shaft member and the spring receiver can be moved up and down. a cap member which is disposed in an opening portion on one end side of the cylinder and into which the hollow rod is inserted; and a nut configured to fix the hollow rod to the cap member, wherein the nut is arranged closer to one end side than the spring receiver (42, 44), wherein the adjusting screw is inserted coaxially with the hollow rod at the one end portion of the hollow rod, wherein screw grooves formed on the outer peripheral surface of the adjusting screw and the inner peripheral surface of the hollow rod are screwed together, so that by rotating the adjusting screw, the adjusting screw can be moved up and down, whereby the shaft member and the spring receiver can be moved up and down.