An airbag device for a vehicle tire capable of stabilizing the vehicle timely when the tire is exploding or being punctured suddenly to avoid potential accidents and to ensure driving comfort. The airbag device comprises a resilient outer ring installed between the tire and the wheel hub, and an inner ring serving to support the resilient outer ring. The resilient outer ring and the inner ring are compressed between the tire and the wheel hub under normal tire air pressure, and a space serving to increase driving comfortability and keep the outer ring from contacting the inner surface of the tire tread is designed between the resilient outer ring and the inner surface of the tire tread. When the tire is exploding or the air pressure of the tire is lost, the resilient outer ring is capable of bouncing instantly to support the weight of the vehicle.