AIRBAG DEVICE

When an airbag is inflated by inflation gas flowing into the airbag, the airbag is inflated rearward while protruding upward from a storage portion on an upper surface side of an instrument panel. The airbag includes a bag main body and an outer tether portion disposed on an outer peripheral surface side of the bag main body. The bag main body has an upward recessed portion on a lower surface side of the front side with respect to an occupant side wall portion disposed on a rear surface side of the completely inflated bag main body. The outer tether portion is provided to connect a rear lower end side of the completely inflated bag main body and a front edge side of the recessed portion so that the rear lower end of the completely inflated bag main body can be disposed close to a rear surface of the instrument panel.