Seat belt retractor

The object is to provide a seat belt retractor (1) for reducing noise when in the clutch-disengaged mode, as well as suppressing power consumption of a motor (6). In order to solve this object, upon reverse rotation of the motor (6) for rotating a spool (4), an upper connecting gear (27) is rotated in the clockwise direction, and both a clutch gear (31) and a rotating shaft (32) thereof are moved along a guide opening (11g) in the right direction. The clutch gear (31) separates from outer teeth (17b) of a carrier gear (17), following which the clutch gear (31) meshes with the inner teeth of a clutch gear stopping/holding portion (11k). Upon the rotating shaft (32) coming in contact with the right end of the guide opening (11g), the movement of the clutch gear (31) and the rotating shaft (32) in the right direction is stopped, as well as stopping rotation of the clutch gear (31). Thus, switching to the clutch-disengaged mode is completed. In this case, a motor current increases due to the increased load of the motor. Upon the motor current reaching a predetermined value, driving of the motor is stopped, thereby reducing noise, as well as suppressing power consumption of the motor.