A medical guide wire including a core wire having a distal end-side small-diameter portion and a proximal end-side large-diameter portion, and a coil spring installed on an outer periphery of the distal end-side small-diameter portion of the core wire along an axial direction, having a front end-side small-diameter portion, a tapered portion and a rear end-side large-diameter portion, and fixed to the core wire, wherein the front end-side small-diameter portion of the coil spring has a length of 5 to 100 mm, and the outside diameter of a coil thereof is at most 0.012 inch, the front end portion of the coil spring is fixed to the core wire by a gold-containing solder, and a length of a distal end portion stiffened by the gold-containing solder is 0.1 to 0.5 mm.
