A stent capable of delaying or preventing occlusion by granulation is provided. The stent (10) includes an outer annular body (11) having an annular cross section, in which an outer through hole (14) penetrating in a direction intersecting the radial direction of the annular cross section is formed and which can expand and contract in the radial direction. , Which is disposed inside the outer through hole (14) and forms a double annular cross section with the outer annular body (11) at least in the opening of the outer through hole (14), and intersects the radial direction of the annular cross section. An inner annular body (12) having an inner through-hole (15) that penetrates the inner annular body, and the outer annular body (11) expands in the radial direction when placed in a living body, and The living body can be supported in a state where at least the opening of the inner through hole (15) is separated from the living body among (12).肉芽による閉塞を遅延又は防止し得るステントを提供する。ステント（１０）は、環状断面を有し、当該環状断面の径方向と交差する方向に貫通した外側貫通孔（１４）が形成されるとともに径方向に拡張収縮し得る外側環状体（１１）と、外側貫通孔（１４）の内側に配置され、外側貫通孔（１４）の少なくとも開口部において外側環状体（１１）とともに２重の環状断面を形成する、当該環状断面の径方向と交差する方向に貫通する内側貫通孔（１５）が形成された内側環状体（１２）と、を有し、外側環状体（１１）は、生体内に留置された際、径方向に拡張して内側環状体（１２）のうち少なくとも内側貫通孔（１５）の開口部を生体から離隔させた状態で生体を支持し得る。
