To provide a method for manufacturing a synthetic resin pipe by sufficiently bonding a synthetic resin pipe and a metal pipe without leaving air especially at the ends of both pipes when the synthetic resin pipe is expanded in its diameter to be bonded to the metal pipe.

The thermally expansible synthetic resin pipe of which the surface is coated with an adhesive is inserted in the metal pipe shorter than the synthetic resin pipe, so that the both pipe ends of the synthetic resin pipe are protruded from both pipe ends of the metal pipe. The whole is introduced into a heating furnace to successively heat the metal pipe from the central part of the pipe to the pipe ends thereof or from one end of the pipe to the other end thereof. The synthetic resin pipe is expanded in its diameter by the heated metal pipe to be closely bonded to the inner surface of the metal pipe to manufacture the synthetic resin lining pipe. Finally, cooling liquid is sprinkled over the vicinities of the pipe end parts, which are heated to be closely bonded to the metal pipe finally, of the synthetic resin pipe arranged, so as to be protruded from the metal pipe to cool the surface temperature of synthetic resin pipe to the softening temperature thereof or lower.