PROBLEM TO BE SOLVED: To provide a defect hole closing material which realizes a minimally invasive treatment for atrial septal defect with almost no possibility of a defect in a remote period. SOLUTION: A defect hole closing material 100 is formed by two cylinders (a first cylinder portion 110 and a second cylinder portion 120 and a substantially central portion 130 between them) of a stitch-like structure of a bioabsorbable material. The first tubular portion 110 is provided with an X-ray impermeable material 110A, the second tubular portion 120 is provided with an X-ray impermeable material 120A, and the substantially central portion 130 is provided with an X-ray impermeable material 130A. Catheter the defect hole closing material 100 to the position of the X-ray opaque material 130A shown in the X-ray fluoroscopic image of the site including the defect hole closing material 100 in the catheter treatment of atrial septal defect. When extruded from 300, the cylinder diameter of the first cylinder portion 110 is not expanded, but only the cylinder diameter of the second cylinder portion 120 is expanded. [Selection diagram] Fig. 2【課題】心房中隔欠損症に対して、遠隔期の不具合の可能性がほとんどない、低侵襲の治療を実現する欠損孔閉鎖材を提供する。【解決手段】欠損孔閉鎖材１００は、生体吸収性材料の編み目状組織の２つの筒体（第１の筒部１１０および第２の筒部１２０ならびにそれらの間の略中央部１３０）により形成され、第１の筒部１１０にＸ線不透過材１１０Ａ、第２の筒部１２０にＸ線不透過材１２０Ａ、略中央部１３０にＸ線不透過材１３０Ａをそれぞれ備える。欠損孔閉鎖材１００を心房中隔欠損症のカテーテル治療において欠損孔閉鎖材１００を含む部位をレントゲン撮像したＸ線透視画像に写ったＸ線不透過材１３０Ａの位置まで欠損孔閉鎖材１００をカテーテル３００から押し出すと、第１の筒部１１０の筒径が拡張されないで第２の筒部１２０の筒径だけが拡張される。【選択図】図２
