To provide an airbag device and a steering wheel capable of improving the operational feeling of horn.An airbag device comprises: an airbag unit 2 having an airbag, an inflator 12 for inflating the airbag, and a cover 13 which is disposed to cover said airbag in the folded state, wherein as the cover 13 is pressed, the airbag unit 2 is moved in the pressing direction; a supporting plate 3 which is fixed to a steering wheel; three springs 4a-4c for biasing the airbag unit 2 in a direction opposite to the pressing direction; and three horn switches 5a-5c which are located outside of the springs 4a-4c in the radial direction of the steering wheel and close to the surface of the cover 13 in relation to the springs 4a-4c.