PROBLEM TO BE SOLVED: To provide a guide wire which is excellent in torque force, and at the same time, can prevent the plastic deformation of a core shaft from occurring.SOLUTION: The guide wire includes: the core shaft which includes a first leading end section and a first rear end section being located on the opposite side from the first leading end section and a coil body which includes a second leading end section and a second rear end section being located on the opposite side from the second leading end section, and is wound around the outer periphery of the first leading end section. The core shaft is constituted by including a first cylindrical section to which the second rear end section is fixed a second cylindrical section which is located closer to the first rear end section side than the first cylindrical section and a third cylindrical section which is located closer to the first rear end section side than the second cylindrical section. The outer diameter of the second cylindrical section is larger than the outer diameter of the first cylindrical section, and also, is smaller than the maximum diameter of the coil body. The outer diameter of the third cylindrical section is larger than the outer diameter of the second cylindrical section, and also, is smaller than the maximum diameter of the coil body.COPYRIGHT: (C)2012,JPO&INPIT【課題】本発明は、トルク力に優れるとともに、コアシャフトの塑性変形を防止することができるガイドワイヤを提供することを目的とする。【解決手段】本発明のガイドワイヤは、第一先端部及び前記第一先端部の反対側に位置する第一後端部を有するコアシャフトと、第二先端部及び前記第二先端部の反対側に位置する第二後端部を有しており、前記第一先端部の外周に巻回されたコイル体とを備えたガイドワイヤであって、前記コアシャフトは、前記第二後端部が固定された第一円筒部と、前記第一円筒部よりも前記第一後端部側に位置する第二円筒部と、前記第二円筒部よりも前記第一後端部側に位置する第三円筒部とを含んでなり、前記第二円筒部の外径は、前記第一円筒部の外径よりも大きく、かつ、前記コイル体の最大径よりも小さく、前記第三円筒部の外径は、前記第二円筒部の外径よりも大きく、かつ、前記コイル体の最大径よりも小さいことを特徴とする。【選択図】図1
