Patent ID: 6997473

Claim:
An air bag device installed in a backrest of a seat for passenger safety, the air bag device comprising: a gas discharging means arranged in the backrest for discharging gas; an air bag connected to the gas discharging means and including an upper chamber and a lower chamber, each being inflated by discharging gas to form a single chamber, wherein the air bag includes a first defining means for defining two chambers comprising the upper chamber and the lower chamber; an impact reducing means for reducing impact applied to a passenger when the air bag contacts the passenger in the seat during inflation of the air bag, wherein the gas discharging means is an inflator for discharging gas toward the lower chamber, and the impact reducing means is arranged in the air bag and includes a communication means for communicating the upper chamber to the lower chamber, wherein the communication means includes a first communication means arranged in a rear portion of the air bag near the backrest.