A guide wire includes an elongate wire body, and a marker at least at a distal-side portion of the wire body over the whole circumference to indicate the intracorporeal position of the wire body. The marker has a first line-forming portion and a second line-forming portion which intersect each other at a plurality of locations so that the marker has a grid-like shape as a whole. According to another aspect, a guide wire includes a member with a core wire, a marker-forming layer partly encircling the outer surface of the member and differing in color from the member, and a coating layer covering the marker-forming layer and the member at least in the marker-forming layer region and having transparency making the marker-forming layer visible. The marker-forming and coating layers can be formed from mutually miscible resins, while the marker-forming layer functions as a visible marker.
