Patent ID: 8186715

Claim:
An airbag comprising: a vertically extended concave portion formed so as to face a front-passenger seat occupant in an inflated state in front of the occupant; 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 the occupant; and 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; an upper joining portion that joins an upper part of said left half airbag to an upper part of said right half airbag on a vehicle rear side among mutually face-to-face portions of the left half airbag and the right half airbag; and a lower joining portion that joins a lower part of said left half airbag to a lower part of said right half airbag on a vehicle rear side among mutually face-to-face portions of the left half airbag and the right half airbag; said upper joining portion and said lower joining portion being discontinuous; and wherein the airbag further comprises: at least one tether for decreasing a width of said left half airbag and a width of said right half airbag along a lateral direction when said left half airbag and right half airbag are inflated, wherein: an end portion of said tether at an airbag center side is stitched by a seam to said left half airbag and said right half airbag; and said left half airbag and said right half airbag are partly joined between said upper joining portion and said lower joining portion by said seam.