Patent ID: 8684399

Claim:
A gas generator comprising an elongated inflator, which discharges gas for inflation and a retainer having a holding portion, the holding portion covering part of the inflator with respect to a direction of an axis of the inflator, wherein a positioning protrusion for determining the position of the inflator relative to the retainer is formed on an outer surface of the inflator, the retainer includes an engagement base and a tongue piece, which extends in the direction of the axis of the inflator and from a position separated from the engagement base in the circumferential direction of the holding portion, the engagement base has an engagement portion, the tongue piece has an engagement portion located at a position separated from a basal end of the tongue piece, the engagement portion of the engagement base and the engagement portion of the tongue piece face each other such that an engagement space is formed between the engagement portions, into which space the positioning protrusion enters, the engagement space has an inlet the width of which is less than a size of the positioning protrusion, and in a state in which part of the inflator is covered with the holding portion, when the inflator is rotated or moved to cause the positioning protrusion of the inflator to increase the width of the inlet, the tongue piece is elastically deformed about a fulcrum, which is the basal end of the tongue piece, to increase the width of the inlet.