When an axis of rotation 9a2 of a spool rotates in the seatbelt retracting direction, a lock gear 13 rotates clockwise which is the same direction as the spool, and an eccentric gear 16 rotates counterclockwise. A cam 20 of the eccentric gear 16 comes into contact with a lever 36 of the control lever 35 to cause the control lever 35 to rotate counterclockwise to take an operating position. A pressed pin 42b of a lever 42 comes into contact with a lever 37, so that levers 42, 43 rotate counterclockwise. A holding portion 42c of the lever 42 opposes a flywheel 14. Accordingly, since the holding portion 42c presses a held portion 14d when the entire amount of a seatbelt 4 is retracted, a rocking movement of the flywheel 14 is prevented and hence end locking is prevented.