An atrial-appendage ligation surgical tool that includes a pressing part and a shaft, in which the pressing part is guided into a pericardium via a sheath penetrating through a pericardial membrane, and includes contact portions that press the vicinity of a base of an atrial appendage and have a circular cross-sectional shape and round distal ends, and in which the shaft is in an inserted state in the sheath, supports the pressing part at a distal end, and has a rigidity that enables transmission of a pressing force acting in the longitudinal direction, applied from the proximal end side of the sheath.
