Provided is a guide wire, which comprises a lengthy wirebody, and a marker disposed in at least the tip side portion ofthe wire body all over the circumference and having a functionto indicate the position of the wire body in a living body. Themarker is formed into a lattice shape as a whole by causing afirst filament portion and a second filament portion tointersect with each other at a plurality of portions. Moreover,the intersecting portions of the first filament portion and thesecond filament portion are formed in plurality in the marker.Noting a predetermined one of those intersecting portions,therefore, the predetermined intersecting portion looks, as ifit moves radially of the guide wire, when the guide wire isturned on its axis. Thus, it is possible to confirm reliablythat the guide wire has been turned.
