Patent ID: 7992897

Claim:
An airbag device comprising an airbag inflatable and deployable by gas and an inflator supplying the gas to the airbag, the improvement comprising: a partition wall dividing the inside of the airbag into a first chamber on the inflator side and a second chamber on the occupant side and having a gas passage which enables the gas to flow between the first chamber and the second chamber; a discharge-state switching member on the first chamber side of the airbag, the discharge-state switching member having vent holes for discharging the gas from the airbag and capable of switching the vent holes between a discharge state discharging the gas from the airbag and a non-discharge state not discharging the gas from the airbag; and a coupling member coupled to the discharge-state switching member at one end thereof and to the partition wall at the other end thereof, the coupling member limiting a movement of the partition wall toward the second chamber and allowing the second chamber to inflate and deploy when the airbag inflates, wherein when the inflator is activated and when the airbag inflates and deploys, the coupling member causes the discharge-state switching member to apply tension to the partition wall side to close the vent holes, and when the inflated and deployed airbag receives an entering occupant and deforms, the coupling member releases the tension to the discharge-state switching member toward the partition wall side to open the vent holes.