| 摘要 |
A seat belt device ( 1 ) including an obstacle detection portion for detecting an obstacle in an area surrounding a vehicle, a collision prediction portion ( 21 ) for predicting a probability of a collision between the vehicle and the obstacle based on a detection signal from the obstacle detection portion, a pretensioner device ( 40 ), and a pretensioner control portion ( 22 ) which controls, when a collision prediction is received from the collision prediction portion ( 21 ), the operation of the pretensioner device ( 40 ) such that seat belt is retracted prior to the collision. Multilevel tensions for retraction of the seat belt are set for the pretensioner device ( 40 ), and furthermore, the tension of the seat belt can be change by the pretensioner control portion ( 22 ) in accordance with a collision prediction level determined by the collision prediction portion ( 21 ).
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