PURPOSE: To enable a high-quality catheter tube to be made in a short time, by providing a heater to blow out a hot blast from the outer periphery of a tube for molding, moving a range including joint portions of a plurality of kinds of tubes covered by the tube for molding from one side to the other side simultaneously with a rotation of the tubes

CONSTITUTION: Tubes 101 through 103 are respectively passed through a shaft 200, and at the same time the end portions of the tubes 101 through 103 are Joined together to be formed like one tube. Thereafter, the tube for molding 104 is moved to cover the tubes 101 through 103 from outside, and a rotating motor of a chuck 2 and a motor of an inner cylinder 41a as well as a motor 46 of a hot blast supplying portion 45 are rotated at an arbitrary speed. Then, the hot blast is supplied rightward from a spiral groove 43 continuously, and the outer periphery of the tube 104 for molding is continuously contracted. Simultaneously with this, the joint portions of the tubes 101 through 103 are deposited and integrated, thereby forming a catheter tube 100 of the same diameter as a whole.