Patent ID: 8596567

Claim:
A seatbelt retractor comprising: a housing which includes a pair of side wall portions; a take-up drum for winding a webbing which is rotatably supported by the pair of side wall portions therebetween and is urged in a webbing-take-up direction while the webbing is wound therearound; and a pretensioner mechanism portion which takes up the webbing by rotating the take-up drum in the webbing-take-up direction in case of vehicle collision, the pretensioner mechanism portion includes: a gas generating member which generates gas; a cylinder which is long and mounted on an outer side surface of one side wall portion of the pair of side wall portions while the gas generating member is attached to one end portion; a pinion gear body which is capable of rotating integrally with the take-up drum; a piston which is movably housed in the cylinder, pressed and driven by pressure of the gas, equipped with a rack getting engaged with the pinion gear body at a side surface portion thereof, and allowed to rotate the take-up drum in the webbing-take-up direction via the pinion gear when pressed and driven; and a cover plate which is mounted to the one side wall portion with an interposal of the cylinder therebetween, the pinion gear body includes: a boss portion which has a cylinder-like shape and extends outwardly in an axial direction from one end portion of the pinion gear body; and a supporting portion which has a cylinder-like shape and extends outwardly in the axial direction from an other end portion of the pinion gear body, wherein the one side wall portion includes a through hole into which the boss portion is rotatably fitted, and the cover plate includes a supporting hole in which the supporting portion is rotatably fitted, and when the cover plate is mounted to the one side wall portion, the boss portion and the supporting portion of the pinion gear body are rotatably supported by the through hole and the supporting hole, respectively.