Patent ID: 8689924

Claim:
An air-bag device for absorbing impact by deploying a tube-shaped air-bag with a gas generated by an inflator, the tube-shaped air-bag being formed by folding a metal sheet, and the tube-shaped air-bag having longitudinally opposite ends blocked by a blocking member, the deployed air-bag having a complete deployment portion positioned on the longitudinally central side and having a substantially constant diameter and incomplete deployment portions positioned on longitudinally opposite end sides and having a diameter that gradually decreases in going toward the blocking member, wherein the air-bag comprises a plurality of vent holes formed in a valley portion or main portion of the fold of the incomplete deployment portion, wherein the complete deployment portion comprises an auxiliary vent hole at a position adjacent to the incomplete deployment portion, and wherein the auxiliary vent hole is disposed so as to be biased further toward the front face side of the air-bag than are the vent holes.