To simply and inexpensively produce an air bag for a safety tire which is prevented from the breakage, damage, etc., of the air bag itself and the inside surface of a tire during the action of the air bag and can sufficiently exhibit necessary functions without increasing weight largely.

Both ends of a hollow molding having a prescribed length are joined endlessly into a ring 4, the ring 4, while the ring 4 is expanded by supplying air in the hollow part of the ring 4, the outside surface part of the ring 4 is crushed into an approximately flat shape, a reinforcing layer 7 of a nonwoven fabric is stuck on the outside surface part, the ring 4 is expanded further in a vulcanization mold, the circumferential orientation of the fibers of the reinforcing layer is increased, and the ring 4 is made adherent to the inner surface of the mold and vulcanized.