Seat belt retractor comprising - a belt shaft rotatably mounted in a frame for winding up a seat belt, and - a blocking device for blocking the belt shaft in the unwinding direction, and - a control disk having a toothing , which disk is rotatably mounted on the belt shaft and is spring-loaded in the winding direction, and - a sensor device having a deflectable inertial mass and a blocking lever which can be deflected by the deflection of the inertial mass , which device - blocks the control disk with respect to the belt shaft in the belt extension direction when a predetermined vehicle deceleration is exceeded due to the deflection of the inertial mass and the blocking lever consequently engages in the toothing of the control disk , and thereby controls the blocking device, and - a counter gear driven by the rotational movement of the belt shaft, and - a first switching device actuated by the counter gear , which device blocks the control disk from afirst predetermined belt extension length (A) in the belt extension direction and releases it again from a second predetermined belt retraction length (B), and - a second switching device actuated by the counter gear , which device fixes the blocking lever in a non-engagement position in the toothing of the control disk from a predetermined belt retraction length (C), - both the first switching device and the second switching device being actuated during the belt retraction movement in the second predetermined belt retraction length (B), characterized in that - the first switching device is formed by a first pivotable switching lever and the second switching device is formed by a second pivotable switching lever , - the second switching lever resting against the first switching lever . - a belt shaft rotatably mounted in a frame for winding up a seat belt, and - a blocking device for blocking the belt shaft in the unwinding direction, and - a control disk having a toothing , which disk is rotatably mounted on the belt shaft and is spring-loaded in the winding direction, and - a sensor device having a deflectable inertial mass and a blocking lever which can be deflected by the deflection of the inertial mass , which device - blocks the control disk with respect to the belt shaft in the belt extension direction when a predetermined vehicle deceleration is exceeded due to the deflection of the inertial mass and the blocking lever consequently engages in the toothing of the control disk , and thereby controls the blocking device, and - a counter gear driven by the rotational movement of the belt shaft, and - a first switching device actuated by the counter gear , which device blocks the control disk from afirst predetermined belt extension length (A) in the belt extension direction and releases it again from a second predetermined belt retraction length (B), and - a second switching device actuated by the counter gear , which device fixes the blocking lever in a non-engagement position in the toothing of the control disk from a predetermined belt retraction length (C), - both the first switching device and the second switching device being actuated during the belt retraction movement in the second predetermined belt retraction length (B), characterized in that - the first switching device is formed by a first pivotable switching lever and the second switching device is formed by a second pivotable switching lever , - the second switching lever resting against the first switching lever . <EOS>