Patent ID: 8702121

Claim:
An airbag device comprising: an airbag that is disposed inside a seating portion of a vehicle's seat and is inflatable under a seated occupant; and an inflator that generates gas to inflate and deploy the airbag, wherein the airbag includes an upper base fabric piece, a lower base fabric piece, and a pair of side base fabric pieces that are joined to one another and form an air chamber therein, wherein the pair of side base fabric pieces are disposed at part of side portions between the upper base fabric piece and the lower base fabric piece and define the shape of an inflated air chamber, and wherein the airbag, in a state in which the upper base fabric piece and the lower base fabric piece are stacked on top of each other and in which a portion between the pair of side base fabric piece is folded forward or rearward, is disposed in the seating portion.