To provide a method for producing a toothed belt which reduces the generation of defective molding as compared with a conventional method.

When a molding 2 mounted on a mold 1 is heated/pressurized, a time difference during molding is formed by setting up a rigidity difference in a rubber cylinder 3 for belt vulcanization on the outside of the molding 2, and a time for residual air to escape is secured by the time difference.