Patent ID: 8414023

Claim:
An airbag folded up and housed in a housing for inflation with inflation gas and deployment, the airbag comprising: an outer circumferential wall made of flexible sheet material; a tuck that is formed by tucking a part of the outer circumferential wall toward an interior of the airbag so as to have a generally V-shaped section, the tuck including two opposing walls that oppose each other, a turn-round region that interconnects the opposing walls and forms a bottom of the tuck and outermost ends of the opposing walls that are adjacent to and continuing to an outer surface of the airbag; a temporary joint that joins the opposing walls of the tuck together partially in an area of the tuck in such a manner as to disjoint when an inner pressure of the airbag at inflation is increased, a periphery of the temporary joint defined by a line that extends in a direction intersectional with a cleft formed between the outermost ends and toward the turn-round region, the line being bent and having first ends proximate the outermost ends and an intermediate region that bulges toward the turn-round region.