Door of Airbag apparatus for vehicle

An airbag apparatus comprises an airbag lid (5) which is provided by a fragile line (3) on a resin instrument panel (2) and a door for holding (8) disposed in the back surface of the airbag lid (5) by fixing a boss (15) projected from the back surface of the airbag lid (5), and the holding door (8) includes an door body portion (9), an installation portion (10), and a hinge portion (11). In the airbag apparatus, a longitudinal bead (21) extending from the hinge portion (11) side to the leading end side of the door body portion (9) is provided, and lateral beads (22, 23) positioned between the hinge portion (11) and an installation portion (hole 16) to the boss disposed in the vicinity of the hinge portion (11) are provided; furthermore, the damage between the holding door and the airbag lid at the time of expanding the airbag can be prevented by constructing the longitudinal bead (21) and the lateral beads (22, 23) to be crossed.