This invention regards the tensioner device for the seat belt which possesses the piston, the aforementioned piston is guided, the inside of pipe when the gas formation vessel is started, is driven by the gas which is formed by the gas formation vessel which is arranged in one part of the tube. The tensioner device of this invention, furthermore, is installed in the aforementioned piston and the cable through opening, possesses the side part which is introduced into the aforementioned inside of pipe. The tensioner device of this invention, the gas formation vessel (16) the tube which is received (10) the storage space (12), specified overflow pass (29 and 41) possessed the aforementioned piston (17) the tube which is received (10) the piston circulation space (11) vis-a-vis, shifting by forming the cross-sectional area part whose aforementioned inside of pipe is narrow, it is arranged.
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