PROBLEM TO BE SOLVED: To provide a medical guide wire having excellent torque transmission property and breakage resistance.SOLUTION: A medical guide wire 1 includes: a distal-side wire 10 constituted of Ni-Ti-based alloy a proximal-side wire 20 constituted of Co-Cr-Ni-based alloy and a joining part 30 bridging across a boundary surface between the distal-side wire and the proximal-side wire. The joining part has the thickness of 1 μm or less and substantially does not include an intermetallic compound having a constituent element of the distal-side wire and a constituent element of the proximal-side wire.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】トルク伝達性及び耐折損性に優れる医療用ガイドワイヤを提供する。【解決手段】医療用ガイドワイヤ1は、Ni-Ti系合金で構成される先端側ワイヤ10と、Co-Cr-Ni系合金で構成される基端側ワイヤ20と、前記先端側ワイヤと前記基端側ワイヤとの界面に跨る接合部30と、を備える。接合部は、厚みが1μm以下であり、先端側ワイヤの構成元素と基端側ワイヤの構成元素とを有する金属間化合物を実質的に含まない。【選択図】図1
