AIRBAG DEVICE

An airbag device includes an airbag main body formed in a bag shape, and a case body in which the airbag main body folded is stored. The airbag main body includes a first folded part including an opening for gas introduction provided in a base end portion of the first folded part, and multiple second folded parts connected to a distal end portion of the first folded part. The airbag main body folded is stored in the case body such that a connecting part among the first folded part and the second folded parts faces a door part of the case body.