AIRBAG DEVICE FOR VEHICLE

The present invention relates to an airbag device for a vehicle, comprising: a curtain airbag which is inflated and deployed between an inner side of the vehicle and an occupant in the event of a vehicle crash; and an inflator for supplying gas to the curtain airbag, wherein the curtain airbag has a configuration including an auxiliary chamber which is inflated and deployed at a position corresponding to the head region of the occupant while the occupant is rotated backward at a predetermined setting angle or more, such that the auxiliary chamber is provided in the curtain airbag so as to correspond to the occupant's head region with a leaning backward position, and the auxiliary chamber is inflated and deployed according to a rotation angle of a backrest of a seat to protect the occupant safely regardless of the rotated angle and posture of the occupant's upper body.