| 摘要 |
The disclosed seat belt retractor and seat belt device improve the reliability of a belt withdrawn amount sensing unit for detecting the withdrawn amount of a belt with a high accuracy. The seat belt retract may comprise a spool for withdrawably retracting a seat belt and a rotation angle detecting unit for detecting a rotation angle of the spool. The rotation angle detecting unit can be a belt withdrawn amount sensing unit for detecting a predetermined rotation angle of the spool in a belt withdrawn direction. The belt withdrawn amount sensing unit can comprise a Hall switch which includes a magnet for moving according to a predetermined rotation amount of the spool in the seat belt withdrawn direction of the spool and a Hall element which is controlled to be turned on or off by the magnet.
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