A guide wire includes a core wire which forms a line shape formed from a flexible metal material. A distal portion of the core wire is arranged in an axial line direction of the core wire and includes a plurality of deformable portions, which are easily-deformable in a specific direction on a plane (x-y plane) with the axial line of the core wire being a normal line, and easily-deformable directions of the adjacent easily-deformable portions among the respective easily-deformable portions are different from each other.
