Patent ID: 8528934

Claim:
An airbag device comprising: an airbag formed by joining opposing base cloths, the airbag being partitioned into at least a first air chamber and a second air chamber; a gas generator for supplying a gas to the airbag which inflates and deploys the airbag; and a diffuser that stores the gas generator, is disposed through the first and second air chambers in the airbag, rectifies the gas generated by the gas generator, and supplies the gas to the first and second air chambers, wherein: the first and second air chambers are partitioned from each other so that the gas supplied through the diffuser cannot directly flow between the first and second air chambers; and the diffuser has a first outlet part and a second outlet part that open into the first and second air chambers, respectively, to thereby let the gas out, one of the first and second outlet parts is connected to one of the opposing base cloths of the airbag, and an opening of the one of the first and second outlet parts narrows gradually and closes by a tension imposed from the connected base cloth due to inflation of the airbag.