Air bag device

An air bag device comprising:

• an air bag body;
• a retainer having an inner space with an opening in which said air bag body is housed, said retainer having a flange portion formed along a peripheral edge of said opening such that said flange portion protrudes outwards from said peripheral edge of said opening generally in a horizontal direction and surrounds said opening by extending along the entire peripheral edge of said opening;
• and
• a lid member fixed to said retainer at said flange portion and configured to close said opening of said retainer, said lid member having a base portion which approaches or abuts a periphery of said flange portion along the entire peripheral edge of said opening and a door portion pivotally connected to said base portion, wherein
• said opening of said retainer has a pair of opposite shorter sides facing each other in one direction and a pair of opposite longer sides facing each other in another direction orthogonal to said one direction such that a dimension in said one direction between the opposite shorter sides is longer than a dimension in said another direction between said opposite longer sides,
• said flange portion of said retainer has a pair of longer side portions which extend along said corresponding opposite longer sides of said opening and a pair of shorter side portions which connect respective end portions of said longer side portions by extending along said corresponding opposite shorter sides of said opening,
• said air bag device further comprises
• a fastening and fixing portion at which a fastening hole formed in said longer side portion of said flange portion is fastened and fixed to another fastening hole formed in said lid member in a corresponding position to said fastening hole with a fastening and fixing member in a manner that forms a fastening fixture between said fastening hole and said another fastening hole, and
• an engaging portion at which said shorter side portion of said flange portion is engaged with said lid member so as to determine a position of said lid member with respect to said flange portion, and
• said engaging portion comprises an engaging protrusion member protruding from said lid member and an engaging hole formed at said shorter side portion which extends generally in the horizontal direction such that said engaging protrusion member is inserted into said engaging hole and engaged with said engaging hole.