Core material

Patent Pending PROBLEM TO BE SOLVED: To provide a core material or a guide wire composed of the core material not to be broken, for which the core material of a base part has relatively high rigidity, and a catheter. ; SOLUTION: In the core 20 of the guide wire, a carbide is dispersed in a base comprising austenitic stainless steel at least in the surface layer of the sectional structure of a core base part 21 or the surface layer of the catheter.