Patent ID: 7648160

Claim:
An air bag device for an occupant seated in a rearmost seat of a vehicle, wherein the vehicle has a roof panel, a rear roof rail, which is connected to the roof panel, a roof headlining, which covers the roof panel and the rear roof rail, and a rear window glass, the air bag device comprising: an air bag, in a folded state, adapted and configured to be accommodated in an upper rear end portion of the vehicle between the rear roof rail and the roof headlining; and an inflator, which supplies gas to the air bag to deploy the air bag, wherein the air bag has a roof side inflation portion and a passenger compartment side inflation portion, wherein the roof side inflation portion is adapted and configured to be inflated between the roof panel and the roof headlining, and wherein the passenger compartment side inflation portion is adapted and configured to be inflated to separate the roof headlining from the rear roof rail and to project toward the passenger compartment from between the rear roof rail and the roof headlining so that the passenger compartment side inflation portion is unfolded downward to be inflated between the rearmost seat and the rear window glass, and wherein at least part of the roof side inflation portion is adapted and configured to be accommodated between the roof panel and the roof headlining, and when not inflated is in an unfolded state forming a substantially planar surface.