Provided is a guide wire having a novel structure, with which it is possible to improve production efficiency and to effectively prevent large irregularities from forming on an outer circumferential surface of a core wire. Further provided is a guide wire having a novel structure, with which it is possible to more meticulously set bending rigidity to a distal end portion thereof. In a guide wire 10 such that a coil 14 is externally mounted about a distal end portion of a core wire 12, a proximal end portion of the coil 14 is integrally joined to the core wire 12 during formation of the coil 14. Furthermore, in a guide wire 10 such that a coil 14 is externally mounted about a distal end portion of a core wire 12, a cross-sectional shape of a wire 24 that constitutes the coil 14 varies in a lengthwise direction of the coil 14.
