PROBLEM TO BE SOLVED: To solve a technical problem for reducing the length and the diameter of a leading plug, while securing the detachment strength of the leading plug from a core wire, etc., in order to enable deep insertion even in a lesion, which is largely bending and meandering, since the leading plug at the distal end part of a conventional guide wire for medical use is too long in the longitudinal direction of the core wire to be inserted to a deep part in the lesion.SOLUTION: The leading plug has a structure constituted of a short and hard part and a leading part through the use of the same or the same kind of joint member, or has a structure where a film layer is formed on the outer circumference of the core wire through the use of the same or the same kind of joint member identical to that of the leading plug. Thus, while securing the detachment strength from the core wire, etc., the leading plug is reduced in length and in diameter.
