Patent ID: 7357411

Claim:
An airbag apparatus comprising: an airbag to be deployed and inflated in a passenger protection area between a vehicle passenger and a vehicle side wall portion in case of vehicle accident, said airbag having a head chamber for protecting a head of a vehicle passenger and a chest chamber for protecting a chest portion of the passenger; a gas supply device for simultaneously supplying gas for deployment and inflation to the head chamber and the chest chamber; and a pressure adjusting device which adjusts an internal pressure of the head chamber to a level higher than an internal pressure of the chest chamber at the time of deployment and inflation of the airbag, wherein said head chamber comprises first, second and third compartments to be inflated sequentially; said first compartment is arranged vertically and is located at a side of the chest chamber; said second compartment is located above the chest chamber and only directly communicates with the first compartment to receive the gas; said third compartment is separated from the second compartment so that the third compartment communicates with the second compartment at one side close to the first compartment and the other side away from the first compartment; and said gas supply device is arranged to first inflate the first compartment to support the second and third compartments, which are inflated with gas flowing from the first compartment, in a position for head protection.