Abstract: A belt retractor comprises: an outer member into which the strap belt can be inserted; core parts rotatably provided inside the outer member; and, an elastic member provided between the core parts and the outer member at a position axially displaced with respect to a belt winding part in the core parts, the core parts having an insertion part into which the strap belt is inserted, and the strap belt winding around the core parts and being stored between the core parts and the outer member by the core parts rotating relative to the outer member according to the bias of the elastic member with the insertion part gripping the belt.