To provide a shock absorber which can integrally be constituted with a rope by simple constitution, and to provide the rope for a safety belt using this.

A part of the rope 10 is wound spirally between the projected line parts 21a of a winding member 21, and the rope 10 wound on the winding member 21 is fixed by a fixing member 22 covering the outer peripheral surface of the winding member 21. A rope main body 11 is pulled out from between the winding member 21 and the fixing member 22 while fracturing the projected line parts 21a of the winding member 21 by tension applied to the rope 10.