A shock absorber (20) includes a fastener (10) and a resilient gasket (30) for receiving the fastener. The fastener includes a shaft (15). The gasket includes an axial portion (31) surrounding the shaft of the fastener and a plurality of resilient tabs (35) extending from the axial portion. Each resilient tab includes an extending portion (351) extending from the axial portion, a bent portion (353) extending outward from the extending portion, and a resilient contacting portion (355) further extending backward from the bent portion and keeping a distance from the extending portion in a direction vertical to the axial direction of the fastener.