Airbag device

In order to provide an airbag device capable of inflating an airbag such that a large passenger confronting area can be obtained thoroughly promptly even if a gas generator has low gas pressure, for folding the airbag (1), first, a first-processed triangular folded member (1') is formed by folding the regions outside of the segments (L1) of a triangle inwardly of the airbag (1). Next, a second-processed hexagonal folded member (1") is formed by folding the regions outside of the three segments (L2) of the first-processed triangular folded member (1') inwardly thereof. Next, a third-processed dodecagonal folded member (1''') is formed by folding the regions outside of the segments (L3) of the vicinities of the six apexes of the second-processed hexagonal folded member (1"). The third-processed folded member (1"') is attached to a retainer together with a gas generator and covered with a module cover, and the module cover is attached to the retainer to thereby arrange an airbag device.