To easily release a composite insulating tube from a mold when the composite insulating tube is molded with the mold.

In a composite insulating tube molding mold comprising a pair of mold units 1-1, 1-2, a covering forming recess 2 for forming a housing comprising a hood and a sheath in the outer circumference of a hollow core member 3 is arranged in each of the mold units 1-1, 1-2, the hollow core member 3 is arranged within the composite insulating tube molding mold, and after the mold is fastened, a covering forming material is filled in a housing forming space around the hollow core member 3, then the mold is heated to the prescribed covering forming material curing temperature to cure the covering forming material. An ejector means 1 for helping the release of a composite insulating tube molded from the mold is arranged. The ejector means 1 comprises a gas flow path which opens at one end in the recess 2, a valve mechanism which closes the opening of the ejector means 1 in molding and opens the opening in releasing to communicate the recess 2 and the gas flow path, and a gas supply means which supplies gas to the recess 2 through the gas flow path.