Patent ID: 8128124

Claim:
An airbag cushion inflated by gas from an inflator comprising: a vent hole; a lid member arranged inside the airbag cushion for covering the vent hole, wherein a proximal end portion of the lid member on the side of the inflator with respect to the vent hole is inseparably joined to the airbag cushion, and a distal end portion thereof on the opposite side from the inflator with the intermediary of the vent hole is separably joined to the airbag cushion by a separable joint member, the joint by the separable joint member is released and the lid member is allowed to be pushed out from the airbag cushion through the vent hole when the interior of the airbag cushion reaches or exceeds a predetermined pressure, and the separable joint member is provided only on an overlapped portion between the lid member and the airbag cushion.