A guide wire for medical use is provided with a coil spring (20) mounted on a distal end side small diameter part (11) of a core wire (10) formed of austenitic stainless steel with a tensile strength of 2600 to 3000 MPa. The coil spring (20) has a tip end side small diameter part (21), a first taper part (22), a middle diameter part (23), a second taper part (24) and a back end side large diameter part (25). A closely coiled portion (201) is formed by the tip end side small diameter part (21), first taper part (22), middle diameter part (23) and second taper part (24), and a loosely coiled portion (202) is formed by the back end side large diameter part (25). The tip end portion of the tip end side small diameter part (21), the back end portion of the second taper part (24) and the back end portion of the back end side large diameter part (25) are affixed to the outer periphery of the distal end side small diameter part (11) of the core wire (10). This guide wire is capable of passing through even constricted areas, has high flexural rigidity, and also has exceptional push-in properties, torque conveyance properties and shape stability properties.本發明之醫療用導引線,係具備:安裝於芯線(10)之遠端側小徑部(11)的線圈彈簧(20),其中該芯線(10)是由拉伸強度為2600MPa~3000MPa的沃斯田鐵系不鏽鋼所形成,線圈彈簧(20),係具有:前端側小徑部(21)、第1錐部(22)、中徑部(23)、第2錐部(24)、以及後端側大徑部(25),並藉由前端側小徑部(21)和第1錐部(22)和中徑部(23)和第2錐部(24),構成密捲繞部分(201),藉由後端側大徑部(25),構成疏捲繞部分(202),並使前端側小徑部(21)的前端部分、第2錐部(24)的後端部分、以及後端側大徑部(25)的後端部分,固定接著於芯線(10)之遠端側小徑部(11)的外周。該導引線,亦能夠插通於狹窄部位,且彎曲剛性高,在可推性、扭力傳遞性、形狀安定性亦優秀。10‧‧‧芯線11‧‧‧遠端側小徑部12‧‧‧錐部13‧‧‧近端側大徑部20‧‧‧線圈彈簧21‧‧‧前端側小徑部22‧‧‧第1錐部23‧‧‧中徑部24‧‧‧第2錐部25‧‧‧後端側大徑部201‧‧‧密捲繞部分202‧‧‧疏捲繞部分31‧‧‧Au-Sn系焊料32‧‧‧Au-Sn系焊料33‧‧‧Ag-Sn系焊料40‧‧‧硬化樹脂40A‧‧‧樹脂層50‧‧‧親水性樹脂層
