Patent ID: 7862077

Claim:
A side-impact airbag to be disposed in a space between a side wall portion of a vehicle and a seat, comprising: base cloths forming a bag-shaped airbag, a plurality of chambers partitioned in the airbag, said plurality of chambers comprising an upper chamber disposed in an upper region of the airbag, a middle chamber disposed under the upper chamber, and a lower chamber disposed under the middle chamber, a first communication passageway situated between the middle chamber and the lower chamber at a rear region of the airbag in a front-and-back direction of the vehicle, said lower chamber being completely sealed so that a gas for inflating the lower chamber is supplied only through the first communication passageway, a second communication passageway formed in a front region of the airbag in the front-and-back direction of the vehicle, said second communication passageway allowing the upper and middle chambers to communicate with each other at the front region, a tether disposed between the upper and middle chambers located at the rear region of the airbag in the front-and-back direction, and a non-expansion portion formed by joining the base cloths together and situated between the upper and middle chambers adjacent the tether to define the second communication passageway at a side opposite to the tether so that the gas supplied at the rear region is substantially led to the upper chamber through the middle chamber and the second communication passageway.