Patent ID: 7584993

Claim:
An airbag device comprising an inflator for generating gas and an airbag expandable by the gas, wherein said airbag includes an attachment side base cloth attached to an opposed side base cloth, said airbag device is provided with a gas inflow port provided in the airbag through which the gas flows in, a vent hole provided in the airbag for discharging the gas flown in the airbag, a cloth-like piece connected to a vicinity of the vent hole at one end thereof with a sewn portion, and to a vicinity of the gas inflow port at the other end thereof releasably, wherein said cloth-like piece does not close the vent hole in a state where the other end is retained, and closes the vent hole due to an internal pressure of the airbag in a state where the other end is released, an arc-like pocket defined between the sewn portion and the vent hole functioning as a gas reservoir for interrupting a flow of gas directed from the gas inflow port toward the opposed side base cloth to guide the interrupted gas into the vent hole, a retaining device for retaining the other end of the cloth-like piece, and releasing means for releasing retention of the retaining device.