The present invention has a main theme for providing a guide wire for medical treatment in which by improving operability and safety, a phenomenon of going erroneously into a branched blood vessel can be repushed. The guide wire for medical treatment of the present invention is a guide wire for medical treatment including a straight-line shaped proximal section (2) and a distal section (3) which is continuous with the distal side of the proximal section (2) and whose most distal portion (36) faces to the proximal direction, wherein the distal section (3) includes a curved portion (32) continuous with the proximal section (2) and a distal portion (34) continuous with the distal side of the curved portion (32), the proximal section (2) and at least a portion on the proximal side of the curved portion (32) continuous with the proximal section (2) are positioned on an identical curved plane (A) , and the distal portion (34) is extended toward a direction backing away from the curved plane (A) and includes the most distal portion (36) in a section of a direction to which the curved portion (32) is curved with respect to an orthogonal plane (B) on an axis core of the proximal section (2) orthogonal to the curved plane (A).
