GAS GENERATOR FITTING PART STRUCTURE, SEAT BELT DEVICE, GAS GENERATOR FITTING METHOD AND WEBBING WINDER MANUFACTURING METHOD

To suppress such a situation in which an area of contact between a jig receiving a load, which is inputted to a gas conduit from a caulking punch, and the gas conduit, becomes narrow.SOLUTION: A gas generator fitting part structure comprises a gas generator 28, and a cylinder 30 to which the gas generator 28 is fitted. The cylinder 30 has: a first cylindrical part 34 which is formed into a cylindrical shape, and into which a gas generated by the gas generator 28 is supplied; and a second cylindrical part 36 which is connected to the first cylindrical part 34, of which a side opposite to the first cylindrical part 34 is opened, and of which an inner diameter and an outer diameter are so as to be larger than an inner diameter and an outer diameter of the first cylindrical part. In the state an end of the second cylindrical part 36 on a side opposite to the first cylindrical part 34 is folded to an inner side in a radial direction, the gas cylinder 28 is fitted to the cylinder 30. A radial thickness T2 of the second cylindrical part 36 on the first cylindrical part 34 side is thicker than a radial thickness T1 of the first cylindrical part 34.SELECTED DRAWING: Figure 4 【課題】かしめ用のパンチからガス導管に入力される荷重を受ける治具とガス導管との接触面積が狭くなることを抑制する。【解決手段】ガスジェネレータの取付部構造は、ガスジェネレータ２８と、ガスジェネレータ２８が取付けられたシリンダ３０と、を備えている。シリンダ３０は、筒状に形成されかつガスジェネレータ２８が発生したガスが供給される第１筒状部３４と、第１筒状部３４に接続されていると共に第１筒状部３４とは反対側が開放されかつその内径及び外径が第１筒状部の内径及び外径よりも大きな内径及び外径に設定された第２筒状部３６と、を有している。第２筒状部３６における第１筒状部３４とは反対側の端部が径方向内側へ折曲げられた状態で、ガスジェネレータ２８がシリンダ３０に取付けられている。第２筒状部３６における第１筒状部３４側の径方向への厚みＴ２が、第１筒状部３４の径方向への厚みＴ１よりも厚くなっている。【選択図】図４