The guide wire is provided with a wire body on the front end of which is a front end tapered section in which the outer diameter decreases gradually towards the front. At least one site of the guide wire behind the front end tapered section is provided with a functional section that is more easily reshapeable and has higher contrast imaging properties than sections before and after said site. The wire body also comprises a constant outer diameter section, which is provided contiguous to the back end of the front end tapered section and in which the outer diameter is constant along the longitudinal direction, and a back end tapered section, which is provided contiguous to the back end of the constant outer diameter section and in which the outer diameter increases gradually towards the back. The functional section is configured from: a reshaping section in which the areas in front and in back of the boundary between the constant outer diameter section and the back end tapered section are reshapeable and a contrast imaging part, which is provided by being wound on the outer circumference of the reshaping section and has contrast imaging properties.La présente invention concerne un fil-guide pourvu dun corps de fil, sur lextrémité antérieure duquel se trouve une section conique dextrémité antérieure dans laquelle le diamètre externe diminue progressivement vers lavant. Au moins un site du fil-guide derrière la section conique dextrémité antérieure est pourvu dune section fonctionnelle qui est plus facilement refaçonnable et présente des propriétés dimagerie de contraste supérieures à celles des sections situées avant et après ledit site. Le corps de fil comprend également une section de diamètre externe constant, qui est placée de façon contiguë à lextrémité postérieure de la section conique dextrémité antérieure et dans laquelle le diamètre externe est constant le long de la direction longitudinale, et une section conique dextrémité postérieure, qui est placée de faço
