An object of the present invention is to provide a medical tubular body that has a configuration capable of expanding the diameter and has little irritation to an inner wall of a blood vessel or the like. A medical tubular body having a ring-shaped body (100) capable of expanding the diameter, wherein the ring-shaped body (100) has a circumferential direction and an axial direction, and is a first member formed in a partial section in the circumferential direction ( 1) and a second member (2) formed in a partial section in the circumferential direction, and the first member (1) and the second member (2) are slidable in the circumferential direction. Is engaged.本発明は、拡径可能な構成を有しながらも、血管等の内壁への刺激が少ない医療用管状体の提供を目的とする。 拡径可能な輪状体（１００）を有する医療用管状体であって、輪状体（１００）は、周方向と軸方向を有し、周方向の一部区間に形成されている第１部材（１）と、周方向の一部区間に形成されている第２部材（２）とを有しており、第１部材（１）と第２部材（２）とが互いに周方向にスライド可能に係合している。
