To prevent the formation of a parting line on an outer wall in the case of manufacturing a soft tube divided therein into a plurality of spaces via partition walls.

A soft tube divided therein into a plurality of spaces via partition walls is molded by a cylindrical outer mold 11 for molding an outer wall of the tube, a mandrel 15 and a plurality of cores 15 to be inserted into an inner space of the mold 11 for providing the plurality of spaces divided via the walls in the tube, and support plates 12, 31 for supporting the mandrel 15 and the cores 14. Since the mold 11 is cylindrical and not a mold splitting structure, no parting line is formed on the outer wall of the tube.