An airbag device capable of avoiding interference between a cushion and a structure at an upper part of a vehicle interior. An airbag device (100) provided in a vehicle having a prescribed structure (152) such as a rearview mirror suspended from an upper part of a vehicle interior includes a cushion (108) inflated and deployed into a bag shape to restrain an occupant of a seat from a front side, and an avoidance-shaped part (154) provided at an upper part of the cushion (108) to avoid contact between the inflated and deployed cushion (108) and the structure (152), and the avoidance-shaped part (154) is recessed downward over a range between positions at prescribed distances from the structure (152) in vehicle forward and backward directions, respectively.