An anastomosis device 3 includes a corrugated circumference section (20;120;120′), a top-side slender member (10A-1;110A-1), and a bottom-side slender member (10B-1;110B-12). The top-side slender member (10A-1;110A-1) is connected to one top section (20A-1;30A-1;120A-1) of the corrugated circumference section (20; 120;120′). The bottom-side slender member (10B-1;110B-12) is connected to one (20B-1;30B-1;120B-12) at the corrugated circumference section (20;120;120′).