GUIDE WIRE WITH MARKER AT END PORTION

PROBLEM TO BE SOLVED: To facilitate the operation of introducing a catheter into a target part by providing an end portion of a guide wire with an advanced function of X-ray imaging. SOLUTION: This guide wire has a metal having an advanced function of X-ray imaging, provided at the end of an end core 2b. The guide wire has a film 4 of synthetic resin making intimate contact with both an advanced X-ray imaging part formed of the metal and the core and having a uniform outside diameter, except at least at the end of the advanced X-ray imaging part 3, with the outside diameter of the metal being approximately equal to the outside diameter of a body side core 2b having the film 4 thereon. The metal is in the form of an annular member which is either a coil- or pipe-shaped member. The advanced X-ray imaging part 3 has a metal layer of advanced X-ray imaging properties which is formed on its outer surface by plating or vapor deposition. The end core 2b tapers toward an end and is preferably made of a pseudoelastic alloy or a superelastic alloy. Further, a pulverized X-ray imaging substance is mixed into at least the end portion of the film of synthetic resin.