AIR BAG DEVICE

An air bag device in which due to coupling between airbag chambers, a passenger is directly restrained in a seat located at each of various positions such that the air bag device responds to various collision modes. The air bag device includes a bridge chamber unfolding in a shape covering a first side of a seat and a front thereof, and a hook chamber unfolding in a shape covering a second side of the seat and the front thereof and coupled to the bridge chamber by a first coupling means in a part overlapping with the bridge chamber.