An organ anastomosis marker (20) is provided with a plurality of marker portions (21), a connecting member (22) and a string-like member (22). The marker portions are formed with an elastic member that reflects ultrasound waves. The marker portions are circular in the no-load state. The connecting member (22) connects the plurality of marker portions (21) at a preset interval. The string-like member (22) has one end fixed to one of the plurality of marker portions which is located on the end. The other end of the string-like member (22) has a length that leads outside the body.
