| 摘要 |
A main controlling section of a controlling unit ( 13 ), when judging a collision risk, drives a motor ( 12 ) in a direction of retracting a seat belt ( 3 ) and raises tension of the seat belt ( 3 ). The main controlling section, when tension of the seat belt ( 3 ) reaches a predetermined value, judges that a locking signal is input and has the motor ( 12 ) continue retracting driving of the seat belt ( 3 ) for a predetermined time and, when a locking signal is not input, decreases a driving power of the motor ( 12 ) and lowers tension of the seat belt ( 3 ). Even when a collision risk signal is erroneously output from a collision risk judging section ( 11 ) and, so long as a locking signal is not output from the locking signal producing section ( 18 ), since control is immediately exerted so that tension of the seat belt ( 3 ) is lowered, it is possible to avoid an unpleasant feeling to a vehicle occupant (A) caused by comparative long-duration and useless restraining using the seat belt ( 3 ).
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