Patent ID: 7314228

Claim:
An airbag device comprising: a bag-shaped airbag folded and housed in the form of a generally rectangular parallelepiped folded-up body; and a wrapping member wrapped around the folded-up body for keeping the folded-up configuration, wherein: the airbag includes an inlet port for admitting inflation gas, and the airbag is folded, when folded into the folded-up body, in reference to a straight base line running through the center of the inlet port along a plane of the inlet port above the inlet port, such that, from a state right before a completely folded-up configuration, both ends of the airbag extending in opposite directions from the base line are brought close to the base line to butt against each other, whereby the folded-up body is formed into a generally rectangular parallelepiped shape symmetric with respect to the base line; the wrapping member is made of flexible sheet-shaped material, and is breakable upon airbag inflation; the wrapping member comprises: a cover portion for holding a top face of the folded-up body, the cover portion including a breakable portion in a region above the base line; and fixing portions located in extensions from the cover portion perpendicular to the base line and fixed to the folded-up body; the breakable portion separates the cover portion along a direction of the base line upon airbag inflation, and includes a plurality of apertures going through the cover portion, and connecting portions for connecting adjacent apertures into a larger opening upon breakage; each of the apertures is located across the base line as to extend toward bath sides from the base line, whereby connecting portions disposed by sides of both of two ends of each of the apertures are located in opposite sides of the base line; the wrapping member further comprises two cut-out portions in edges of the cover portion that are transverse to the base line, between each of the cut-out portions and an aperture disposed in the vicinity of the cut-out portion being a marginal connecting portion that is breakable upon airbag inflation; and the two cut-out portions are located in generally symmetric positions with respect to a point in the base line corresponding to the center of the inlet port.