PURPOSE: To provide a method for manufacturing a collar returned composite tube in which delamination of metal and synthetic resin boundary, an environmental stress crack of synthetic resin, oxidation deterioration at the color returned part of the tube covered at heat at the inner surface of the tube with the synthetic resin do not occur and which has excellent durability.

CONSTITUTION: The end of a composite tube 13 covered at least at the inner surface of a metal tube 131 with synthetic resin 132 is collar cold returned, and the returned part is annealed at a temperature lower by 30°C than the softening temperature of the synthetic resin.