PURPOSE: To eliminate a sewing process in producing an air bag and simplify an air bag manufacturing process, and automatize a joint process by sticking part or the whole of the jointed section of a plurality of foundation cloth one another, using an adhesive.

CONSTITUTION: In an air bag used by inflating and developing a bag formed by jointing a plurality of foundation cloth 3, 4 cut to a predetermined shape by pressure gas from an inflator, part or the whole of the jointed par of the foundation cloth 3, 4 is stuck to one another, using an adhesive. The result eliminates a sewing process in producing the air bag. Therefore, the simplification of an air bag manufacturing process, and the automatization of a jointing process (e.g. application of an adhesive from an automatic discharging machine and hardening the adhesive) are possible. This materializes the dramatically rationalized manufacturing process.