AIRBAG DEVICE

An airbag device including: a folded airbag; an attachment member configured to houses the folded airbag and to be fixed to the vehicle; and an airbag lid including a main body portion and a protruding support portion. The main body portion is connected to the attachment member in a state of covering the folded airbag from a side opposite to the attachment member. The protruding support portion protrudes from the main body portion. At least a part of the protruding support portion is covered by the trim. The protruding support portion includes: a base end side edge portion joined to the main body portion; a tip end side edge portion provided on a side opposite to the base end side edge portion; a locking portion attaching to the trim; and a reinforcing portion provided continuously along the tip end side edge portion.