Patent ID: 7837228

Claim:
An airbag comprising: a vent hole provided in a distal-to-occupant side face on the other side of an occupant-facing face, or in a side face of the airbag in a state of being inflated; a cover member covering the vent hole; and a connecting member connecting the cover member and the occupant-facing face, passing though the inside of the airbag, wherein the occupant-facing face and the distal-to-occupant side face are joined together with a joining body on the center side of the airbag relative to the vent hole so as to be disengageable; an intermediate portion of the connecting member in its extension direction is sandwiched between the occupant-facing face and the distal-to-occupant side face, while being joined to both the occupant-facing face and the distal-to-occupant side face with the joining body; the joint of the occupant-facing face, the distal-to-occupant side face and the connecting member with the joining body is disengaged when internal pressure of the airbag becomes equal or more than predetermined; after this, until an occupant comes in contact with this airbag, the cover member is prevented by the connecting member to move to the outside of the airbag and overlaps on the vent hole, and thereby the vent hole remains closed or is made open to a small extent; and when the occupant comes in contact with this airbag and the occupant-facing face is moved backward, the cover member is separated from the vent hole by gas pressure in the airbag and thereby the vent hole becomes opened or is made open to a large extent; wherein the cover member covers the vent hole from the inside of the airbag; an inserting-through portion for the connecting member is provided on the inner surface of the airbag in the distal-to-occupant side face or the side face; one end side of the connecting member is connected to the occupant-facing face, an intermediate portion of the connecting member is inserted through the inserting-through portion, and the other end side of the connecting member is connected to one end of the cover member; and an end portion of the cover member on the side opposite to the connecting member across the vent hole.