SEATBELT RETRACTOR

A spool and a locking base are connected through a torsion bar A stop gear and a positioning member are engaged through threads with the male thread of a locking base so as to be separated from each other a predetermined distance. The locking base and the torsion bar are mounted to the spool while the distance of separation between the stop gear and the positioning member is accurately set to a specified distance. When the tension of webbing increases due to the movement of a vehicle occupant in a vehicle collision and provides the torsion bar with EA rotation while twisting the torsion bar the stop gear advances toward the positioning member and comes into contact therewith.