SEAT BELT RETRACTOR

The present invention relates to a seat belt retractor comprising: a spindle module including a seat belt webbing and a spindle having an outer surface on which the seat belt webbing is wound; and front and rear brackets respectively coupled to front and rear sides of the spindle module, wherein the front and rear brackets have first and second flange parts formed on both ends of the front and rear brackets so as to be fixed to a backrest frame of a seat in a state of the front and rear brackets overlapping each other, so that when an emergency situation of a vehicle occurs, an occupant can be restrained and safely protected, and the angle of insertion and withdrawal of the seat belt webbing can be variously adjusted.