Provided is a medical elongated body that suppresses axial expansion while maintaining high flexibility and has high torque transmission capability even in a bent state. A long body for medical use 10 having a tubular body 70, the tubular body 70 having a slit 71 that spirally extends while meandering, and the slit 71 forms a pair of a first opposing surface 100 and a second opposing surface 100. The first facing surface 100 forms a first convex portion 101, and the first convex portion 101 has a first wide portion 108 that is wide in the circumferential direction Y. And the second facing surface 110 forms a first recess 102 that surrounds and accommodates the first wide portion 108, and the first protrusion 101 is formed on the first flat portion 103 and both ends thereof. The first side portion 104 is connected, and the first side portion 104 and the first plane portion 103 are tangentially discontinuous in the circumferential development. [Selection] Figure 4【課題】高い柔軟性を保持しつつ軸方向への伸びを抑制し、かつ曲げた状態であってもトルクの伝達能力が高い医療用長尺体を提供する。【解決手段】管状体７０を有する医療用長尺体１０であり、管状体７０は蛇行しつつ螺旋状に延びるスリット７１を有し、スリット７１は対をなす第１の対向面１００および第２の対向面１１０から形成され、第１の対向面１００は、第１の凸部１０１を形成し、第１の凸部１０１は、周方向Ｙに幅が広がっている第１の幅広部１０８を有し、第２の対向面１１０は、第１の幅広部１０８を囲んで収容する第１の凹部１０２を形成し、第１の凸部１０１は、第１の平面部１０３とその両端部に接続する第１の側部１０４とを有し、周方向展開図において、第１の側部１０４と第１の平面部１０３が接線不連続である。【選択図】図４
