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 in the belt extension direction and releases it again from a second predetermined belt retraction length, 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, - both the first switching device and the second switching device being actuated during the belt retraction movement in the second predetermined belt retraction length, 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 in the belt extension direction and releases it again from a second predetermined belt retraction length, 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, - both the first switching device and the second switching device being actuated during the belt retraction movement in the second predetermined belt retraction length, 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.