| 摘要 |
A torsion bar is mounted inside a take-up drum with its one end fixed thereto for disabling its relative rotation with respect to the take-up drum. A slit is formed in parallel to rotational axis of the take-up drum and allows one end of the webbing to pass through. At one end of the webbing, there is provided a slip-off prevention member. Length consisting of the slip-off prevention member's diameter and thickness of the webbing surrounding the slip-off prevention member is longer than distance between outer-diameter-side surface of the slit at the take-up drum and outer diameter surface of the torsion bar inside the take-up drum so as to prevent escape of the slip-off prevention member therefrom. The slip-off prevention member's load to depress the take-up drum in fully-pulled-out state of webbing is received by both the torsion bar and the take-up drum.
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