There is provided a defect hole closing material which achieves minimally invasive medical treatment for Atrial Septal Defect, and poses little possibility of occurrence of a failure in the body in some distant future.The defect hole closing material (100) comprises two bioabsorbable material-made cylindrical bodies (the first cylindrical section (110) and the second cylindrical section (120)) having a mesh-like structure in the form of an hourglass shape, a numeral “8” shape, a double spindle shape, or a peanut shape. With the first end (112) kept held securely, the second end, or the other end (122) is pulled toward the first end (112) by operating the string (140), whereupon the cylinder diameter is increased, and also the first cylindrical section (110) and the second cylindrical section (120) move close to each other with respect to the substantially central section (130) serving as a center.
