| 摘要 |
To protect a wire without increasing the manufacturing cost. A pretensioner 10 comprises a housing 12 through which the wire 11 is passed and a cylinder 14 supported to the housing 12. One end of the wire 11 is connected to a seat belt buckle, and the other end of the wire 11 is connected to a piston 15 slidably received in the cylinder 14. A gas generator 23 for generating a high-pressure gas for moving the piston 15 in the direction of retracting the wire 11 is provided on the housing 12. Furthermore, a seal member 30 for sealing a clearance between the wire 11 and the inner wall of the housing 12 is provided in the housing 12. An agent for improving heat resistance is applied onto an agent applied portion 11A of the wire 11 positioned within a gas passage 24.
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