Shock absorber

A shock absorber comprising:

• a tube having an inner chamber inside;
• a first valve assembly connected to one end of the tube in an axial direction;
• a piston assembly dividing the inner chamber into a first chamber and a second chamber;
• a piston rod extending from the tube through the first chamber with the piston assembly connected to an intermediate position thereof in the axial direction;
• a cup provided in the second chamber;
• and
• a second valve assembly disposed in the second chamber to be connected to the piston rod and configured to enter and exit from the cup, wherein
• the cup includes:
• a sleeve disposed in the second chamber with a gap between itself and the tube in a radial direction;
• and
• a base adapter fixed to the sleeve by press fitting and provided between the sleeve and the first valve assembly, and wherein
• a groove extending in the axial direction of the sleeve is provided at an inner circumferential portion on one end side of the sleeve in the axial direction and an inner circumferential portion on the other end side of the sleeve in the axial direction.