PROBLEM TO BE SOLVED: To suppress generation of a shadow of a guide wire when executing tomography of a living body lumen such as a blood vessel using an imaging catheter.SOLUTION: A medical guide wire 10 includes a flexible core part 20, a first coil part 30 in which a first element wire is wound at the distal end part of the core part, a second coil part 40 in which a second element wire is wound at the core part 20 on a proximal side relative to the first coil part 30, and a coating layer 50 having infrared transmission properties for coating the second coil part 40. A wire diameter of the second element wire is smaller than the wire diameter of the first element wire, and a gap between the second element wires is larger than the gap between the first element wires.SELECTED DRAWING: Figure 2【課題】イメージングカテーテルを用いて血管等の生体管腔内の断層撮影をする際にガイドワイヤの影を生じにくくさせる。【解決手段】医療用ガイドワイヤ１０は、可撓性を有する芯部２０、芯部の遠位端部分に第１素線が巻回されてなる第１コイル部３０、第１コイル部３０より近位側の芯部２０に第２素線が巻回されてなる第２コイル部４０、および第２コイル部４０を被覆し、赤外線透過性を有する被覆層５０を有する。第２素線の線径は第１素線の線径より細く、かつ、第２素線間の隙間は第１素線間の隙間より大きい。【選択図】図２
