Patent ID: 7810619

Claim:
A fluid-pressure shock absorber comprising: an external cylinder with an open portion provided at one end thereof; a piston rod, a tip of which projects from the open portion of the external cylinder so that the tip is placed outside the external cylinder; a rod guide arranged at the open portion of the external cylinder, wherein the open portion of the external cylinder is closed by applying caulking works to the open portion of the external cylinder so as to make a caulking portion, the caulking portion being formed such that the open portion of the external cylinder is caulked approximately in a perpendicular direction and in a radial direction, forming a flat curl portion; and the fluid-pressure shock absorber further comprising: a cap holder retaining a bump cap; and the bump cap comprising a barrel portion and a base portion, the barrel portion extending from the base portion to the open portion of the external cylinder, and further comprising an annular side surface provided on a side of the open portion and abuts to the flat curl portion, the bump cap coaxially arranged relative to the external cylinder, wherein the cap holder comprises: a caulking receiving portion extending in a radial direction; and a retention portion extending in an axial direction and restricting relative displacement of the bump cap in the axial direction, the retention portion being cylindrically formed and having an outer diameter portion into which an inner diameter portion of the barrel portion of the bump cap is press-fitted, and, the barrel portion of the bump cap is abutted to one end of the external cylinder, so that a clearance in an axial direction is formed between an end portion of the cap holder on a side towards the tip of the piston rod and the base portion of the bump cap.