Patent ID: 8025311

Claim:
An air-bag comprising: a circumferential wall including facing wall portions which define a free inflation portion in which a distance between the facing wall portions is not controlled and a distance controlled portion in which a distance between the facing wall portions is controlled; and a tether including two edges on each of which a seam margin is provided, both seam margins has a linear stitch which joins the seam margin with the corresponding facing wall portion and controls a distance between the facing wall portions of the distance controlled portion, and at least one of the seam margins has a curved stitch which is continued from an end of the linear stitch and provided at least at one end of the seam margin, wherein the curved stitch forms a gradually expanding portion between the free inflation portion and the distance controlled portion, which gradually expands in an outward direction perpendicular to the facing wall portions, the linear stitch is stitched in a longitudinal direction of the tether, the curved stitch continues from the linear stitch and extends to an end of the curved stitch in a width direction and the longitudinal direction of the tether, and the end of the curved stitch is separated and spaced apart from an edge of the air-bag.