Patent ID: 7530595

Claim:
A rear seat side airbag device adapted to be mounted on a side of a rear seat in a compartment of a vehicle, comprising: an airbag inflatable for deployment between a body side portion of the vehicle and an occupant in the rear seat by a gas from a gas generating source; a case formed for accommodating the airbag in a folded state, wherein the case is formed by a plurality of walls, which include a first wall and a second wall, and the first wall is opposed to the second wall; an opening defined in the case from which the airbag is expanded for deployment; a cover covering the opening; and a contact portion integrated with the cover with which the cover is brought into contact with the case, wherein the cover includes; a breakable portion, which is constructed to break when the airbag is inflated, wherein the breakable portion is formed at a location that corresponds to the opening in the case, a lid, which is in front of the opening, and a hinge, which is a flexible portion of the lid that permits the lid to bend away from the case, and the case includes a fragile portion provided in the first wall, so that a strength of the first wall is lower than that of the other walls, the fragile portion is located on a side of the case that corresponds to the breakable portion of the cover, the fragile portion is formed with a slit in the first wall of the case, the case further includes a reinforcement portion provided on the second wall of the case, which is located on a side of the case that corresponds to the hinge, so that a strength of the second wall is greater than that of the other walls, and fitting projections are provided on the fragile portion, and the fitting projections have inserting holes into which protruding teeth, which are located at equal intervals, are fitted.