| 摘要 |
A door substrate 21 includes a plate-like door substrate body 22, a peripheral flange 32 formed on the outer periphery of the door substrate body, a hinging wall 23 protruding from the back of the outer periphery of said door substrate body so as to correspond to one side of the air bag case and an attaching wall 24 protruding from the back of the outer periphery of the door substrate body so as to correspond to at least one of the remaining sides of said air bag case. The door substrate includes a hinging side outward-extending sandwiching piece 31 formed on the back of the peripheral flange 32 on the side of said hinging wall or the side of the hinging wall, and a fragile portion 27 for breakage at the stem of the attaching wall 24 and an attaching side sandwiching piece 29 formed on the side wall of the attaching wall to sandwich an peripheral edge of an air bag door opening. The hinging wall is secured to the air bag case.
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