| 摘要 |
In an airbag ( 2 ), a length extending from a sewn portion ( 10 ) to a right periphery of a presser plate ( 13 ) is set such that a length (L 1 ) is shorter than a length (L 2 ) wherein the length (L 2 ) is at an attachment side base cloth ( 3 ) side and the length (L 1 ) is at a cloth-like piece ( 9 ) side. When the airbag ( 2 ) is expanded in emergency situations, the attachment side base cloth ( 3 ) is expanded while it moves away outwardly from the cloth-like piece ( 9 ), thereby opening a vent hole ( 8 ), so that the airbag ( 2 ) is eased in abrupt expansion directing toward an occupant. When the airbag ( 2 ) becomes a sufficient size to protect the occupant, it bends instantaneously a retaining plate ( 17 ) to release the parallel portion ( 9 B) of the cloth-like piece ( 9 ) from the presser plate ( 13 ), so that the cloth-like piece ( 9 ) is brought into intimate contact with the attachment side base cloth ( 3 ) to close the vent hole ( 8 ), thereby protecting the occupant with reliability.
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