AIRBAG DEVICE AND VEHICLE SEAT

PROBLEMThe present invention provides an airbag device that can reliably restrain the occupant in question regardless of the posture of the occupant seated in a seat.RESOLUTION MEANSThe present invention is an airbag device equipped in a vehicle seat having a seat cushion forming a seat surface and a seatback forming a backrest, containing:an inflator that generates an expansion gas; andan airbag that is stowed in the seatback and is deployed by the expansion gas discharged from the inflator. The airbag includes a pair of left and right side chambers that deploy from the side parts of the seatback forward and an upper chamber that is provided continuously with the side chambers and deploys above the head of the occupant. In addition, the airbag, from a state of being spread out prior to stowing, is rolled or folded and compressed in a long rod shape in a direction intersecting a longitudinal direction. Furthermore, the location corresponding to the upper chamber of the long rod shaped airbag is stowed in a stowing part provided at the rear surface of the headrest at the upper part of the seatback.