To facilitate manufacture of an airbag cover, and to improve dimension accuracy thereof, in regard to an airbag device structured by providing a door frame movable body and a door frame fixing body in a back surface of an interior trim panel so that a door part is opened, while lifting the door frame movable body, and in regard to a cover for the same.

When an inflator 14 is operated to inject gas, the door frame movable body 32 is pushed upward by the expanding airbag 12, and moved upward (lifted). A module cover 20 is broken along a tear line 22b, and a door part 24 is separated from the peripheral module cover 20. The door part 24 is, furthermore, moved upward with the door frame movable body 32, and while pushed by the airbag 12, and the tear line 22a of the door part 24 is broken, and the door part 24 and each of lining plates 32a and 32b are divided into two in right and left (a figure 2) and opened like a door, and the airbag 12 is expanded inside a cabin. The door frame fixing body 34, the door body movable body 32 and a module cover body 21 are integrally formed with each other by two-color molding.