Seat belt retractor and seat belt device

Abstract

Provided are a seat belt retractor and a seat belt device capable of stably supplying components and avoiding an increase in cost even when an injection body made of resin is used. A spool 2 which winds up webbing which restrains an occupant, a base frame 3 which accommodates the spool 2 so as to be rotatable, a spring unit 4 which biases the spool 2 in a winding direction, a pretensioner 5 capable of winding up the webbing in an emergency, and a lock mechanism 6 capable of stopping withdrawal of the webbing are provided, the pretensioner 5 including a rotating body 51 concentrically connected to the spool 2 and an injection body 52a made of resin which rotates the rotating body 51, the rotating body 51 made of metal having a wall thickness T half a diameter D of the injection body 52a or smaller.

Dependencies are inferred from the claim text.