Patent ID: 7934747

Claim:
An airbag comprising: a base-end chamber disposed on a vehicle front side; a left half airbag that is continuous with said base-end chamber and is to be inflated on a front left side of an occupant; a right half airbag that is continuous with said base-end chamber and is to be inflated on a front right side of the occupant; a hollow portion that extends in a substantially vertical direction outside said airbag between the left half airbag and the right half airbag at the occupant side of said base-end chamber in an inflated state; a vertically extended concave portion formed by means of joining said left half airbag and said right half airbag by stitching on mutually face-to-face portions at the occupant side of said hollow portion in an inflated state so as to face said occupant; a depth of said concave portion in an intermediate part along the vertical direction being greater than both of a depth of said concave portion in an upper part and a depth of said concave portion in a lower part.