The invention discloses an air bag device and an automobile applying the same, and relates to the technical field of automobile manufacturing, in order to solve the technical problem that an existingair bag protective device cannot support a head well, an air bag cannot be supported so that the protective effect is poor, and besides, when a driver drives alone, the air bag cannot have any protective effect when passenger side impact occurs. The air bag device is installed at the top of the automobile and provided with T-shaped two-way protection with an drawstring structure, wherein the air bag device comprises a gas generator and an air bag body connected with the gas generator, specifically, after the air bag body is blasted by the gas generator to be unfolded, the air bag body is in the shape of T, the rear part of the air bag body is in fixed contact with a driving seat and a copilot seat of the automobile, and the front part of the air bag body is fixed by a drawstring mounted atthe top of the automobile.