Patent ID: 7832760

Claim:
A head protecting airbag system comprising: an inflator that is activated, upon at least one of a side collision and a rollover of a vehicle, to inject gas; an airbag that includes: a gas supply path connected to the inflator; an inflation section that is constituted by a first cell that includes a first top opening which is communicably connected with the gas supply path, a second cell that includes a second top opening which is communicably connected with the gas supply path, and a third cell that includes a communicating part that introduces gas into the third cell from only the second cell, the inflation section being connected to the gas supply path and being located on a passenger compartment side of a side window opening to protect the head of an occupant in a deployed state; a vertical cell that extends in the vehicle height direction and is provided at the rear of a pillar of the vehicle, the vertical cell extending in the vehicle height direction, an upper end of the vertical cell being communicably connected to only the gas supply path, a sectional area of the vertical cell in the deployed state being smaller than each sectional area of the first cell, the second cell and the third cell, when viewed in the vehicle height direction; a horizontal cell that is provided in a vehicle longitudinal direction below the inflation section, and that is deployed to an area of the passenger compartment below the side window opening after the inflation section is deployed, the horizontal cell being communicably connected with the vertical cell through a bottom end of the vertical cell, wherein the airbag is folded up in a vehicle height direction and stored along a roof side rail section of the vehicle, and is deployed downward along a side of a vehicle body in a passenger compartment when inflated by gas from the inflator.