To provide an artificial heart valve capable of aiding the functions of the mitral valve of a patient in a minimally invasive manner.SOLUTION: An artificial heart valve 1 which includes a ring 3 being a valve leaflet securing part, and valve leaflets (a first valve leaflet 5 and a second valve leaflet 7). The valve leaflets are connected to the valve leaflet securing part at the top portion of the artificial heart valve, the valve leaflets each having a region 37 which narrows in width toward the bottom of the leaflet.SELECTED DRAWING: Figure 1【課題】低侵襲で患者の僧帽弁の機能を助けることができる人工心臓弁を提供する。【解決手段】弁葉固定部であるリング３と，弁葉（第１の弁葉５と，第２の弁葉７と）を含む人工心臓弁１であって，弁葉は，人工心臓弁の上部において弁葉固定部と接続され，弁葉は，下方に進むほど幅が狭くなる部位３７を有する。【選択図】図１
