Has a core wire 2 forming a linear shape made of a metal material having flexibility, provided side by side in the axial direction of the 2 core wire, the guide wire 1, the distal end portion 22 of the second core wire, the core wire has a deformable portion 221 to 224 multiple easy deformation in the direction of the specific surface and normal to the axis of the 2 in the (xy plane), the easily deformable portion adjacent each of the deformable parts 221 to 224 direction easy deformation is different.ガイドワイヤ1は、可撓性を有する金属材料で構成された線状をなすコア線2を有し、コア線2の先端部22は、コア線2の軸線方向に並んで設けられ、コア線2の軸線を法線とする面(xy平面)上での特定の方向に変形容易な複数の易変形部221~224を有し、各易変形部221~224の隣接する易変形部同士の変形容易な方向が異なっている。
