Provided is an artificial aortic valve leaflet useful in the surgical treatment of aortic valve disorders through the reconstruction of aortic leaflets. The artificial aortic valve leaflet comprises a plane having four sides, three sides of which are linear and a remaining side of which is curved. The distance between a center of the curved side and a center of the side opposite the curved side ranges from 0.35 to 0.70 times a length of the side opposite the curved side. The length of each side adjacent to the curved side ranges from 0.20 to 0.50 times the length of the side opposite the curved side.
