An airbag apparatus comprises an airbag deployed between a vehicle and a passenger with gas generated by an inflator. The airbag comprises a first panel cloth, a second panel cloth attached to the first panel cloth, a reinforcement cloth fastened to the inner face of the second panel cloth, and tethers connecting the periphery of the reinforcement cloth to the first panel cloth. The center of the reinforcement cloth is disposed below the center of the second panel cloth. The tethers are disposed below the center of the reinforcement cloth. The inflator injects gas from the central portion of the first panel cloth towards the inside of the airbag. The airbag apparatus is preferably a driver's seat airbag apparatus.