An airbag device includes an airbag, an airbag cover which covers the airbag, and a holder which holds the airbag and the airbag cover. The airbag cover includes a door portion which is pushed by the inflating airbag and opened with a hinge portion around a rotation center. A functional component is provided on the door portion and connected to and held by a deformable holding member. The holding member includes a distal side connecting portion connected to the functional component, a proximal side connecting portion connected to a part which can ensure an attachment strength, and a deformation portion which is provided between the distal and proximal side connecting portions and deformed to maintain a connection and holding state of the distal side connecting portion with the functional component and reduce a centrifugal force of the functional component acting on the hinge portion when the airbag is inflated.