Seat belt retractor comprising two parallel-acting load limiting devices (6, 7) with - a two-part belt shaft which is pivot-mounted around a rotational axis in the legs (4, 5) of a U-shaped frame, and which comprises a first part, onto which a belt webbing can be wound, and a second part, which can be locked so as to be vehicle-fixed in relation to at least one of the legs (4, 5) of the frame using a locking device which can be actuated in a vehiclesensitive and/or belt webbing-sensitive manner, and - a first load limiting device which upon activation enables a load-limited relative motion between the first part and the second part, and - a second load limiting device which upon activation acts parallel to the first load limiting device (6, 16), wherein - the first and the second part (9, 10) of the belt shaft overlap axially forming a ring chamber in a section between the legs (4, 5) of the frame, and - the second load limiting device is formed by a band element which with a first portion (20, 21) rests against a radial outer wall of the ring chamber and with a second portion (29, 30) rests against the radial inner wall of the ring chamber, and which is deflected between the first and the second portion (20, 21, 29, 30) in a deflection point (22, 23), wherein - the band element, upon a relative motion between the first and the second part (9, 10), can be wound off the outer wall and onto the inner wall or the other way round in an energy absorbing manner by the deflection point (22, 23) revolving, characterized in that - on the first or the second part (9, 10) of the belt shaft elastically and/or plastically deformable designed formations are provided, which extend into the region of the ring chamber passed through by the deflection point (22, 23) while revolving. - a two-part belt shaft which is pivot-mounted around a rotational axis in the legs (4, 5) of a U-shaped frame, and which comprises a first part, onto which a belt webbing can be wound, and a second part, which can be locked so as to be vehicle-fixed in relation to at least one of the legs (4, 5) of the frame using a locking device which can be actuated in a vehiclesensitive and/or belt webbing-sensitive manner, and - a first load limiting device which upon activation enables a load-limited relative motion between the first part and the second part, and - a second load limiting device which upon activation acts parallel to the first load limiting device (6, 16), wherein - the first and the second part (9, 10) of the belt shaft overlap axially forming a ring chamber in a section between the legs (4, 5) of the frame, and - the second load limiting device is formed by a band element which with a first portion (20, 21) rests against a radial outer wall of the ring chamber and with a second portion (29, 30) rests against the radial inner wall of the ring chamber, and which is deflected between the first and the second portion (20, 21, 29, 30) in a deflection point (22, 23), wherein - the band element, upon a relative motion between the first and the second part (9, 10), can be wound off the outer wall and onto the inner wall or the other way round in an energy absorbing manner by the deflection point (22, 23) revolving, - on the first or the second part (9, 10) of the belt shaft elastically and/or plastically deformable designed formations are provided, which extend into the region of the ring chamber passed through by the deflection point (22, 23) while revolving.