<；P>；PROBLEM TO BE SOLVED: To provide a catheter manufacturing method for appropriately putting an operation wire through a sub-lumen regardless of the reduced diameter of the catheter. <；P>；SOLUTION: In the catheter manufacturing method for manufacturing the catheter 10 including: a main lumen； the sub-lumen with a diameter smaller than that of the main lumen； and the operation wire 40 slidably put through the sub-lumen, and comprising a resin material 12, the catheter 10 is molded by extruding the operation wire 40 together with a core wire 22 and the resin material 12 in a state where a clearance 42 is formed in the diameter direction of the operation wire 40 between the core wire 22 for forming the resin material 12 and the main lumen, and the operation wire 40. <；P>；COPYRIGHT: (C)2010,JPO&INPIT
