Patent ID: 8807589

Claim:
A case member of an airbag device that accommodates an airbag between the case member and a cover member, the airbag being inflated and expanded from a retracted state through an introduction of gas, comprising: a base plate portion including a plate-shaped core layer made of a metal and a stack portion having resin layers made of synthetic resin and overlapping both faces of the core layer; and a peripheral wall portion made of the synthetic resin, integrally formed with the resin layers, rising from a peripheral edge of the base plate portion, and surrounding the airbag in the retracted state; wherein the core layer inside the base plate portion has a fitting portion to be fitted into a side of the airbag device, and the fitting portion of the core layer is formed in a manner to swell from a surface of the core layer so as to be exposed from the stack portion, and is configured to have a planar shape that is substantially flush with the resin layers.