Patent ID: 7431329

Claim:
An air bag device comprising: a chest or waist protecting air chamber for protection of the chest or the waist of an occupant, a head protecting air chamber for protection of the head of the occupant, and a diffuser in a bag-like shape, interposed therebetween, having a first communicating hole and a second communicating hole for portioning out gas from an inflator to the head protecting air chamber and the chest or waist protecting air chamber, respectively, wherein the head protecting air chamber is provided with a head tether extending upwardly, a gap is formed between the upper edge of the head tether and the upper edge of the air bag for guiding gas jetted from the first communicating hole so as to go around from the back side of a head protection region of an air bag toward the front side thereof while the second communicating hole is formed so as to be smaller in opening area than the first communicating hole, and vent holes are formed in the chest or waist protecting air chamber.