PROBLEM TO BE SOLVED: To provide a duplex container which includes a container body including a cutting unit for cutting a partition wall formed in a sub-container and which is configured in such a manner that when the sub-container is mounted on the container body, the partition wall is cut and the content contained in the sub-container flows into the container body, the duplex container having such a constitution that even if the sub-container is mounted on the container body and the partition wall of the sub-container is cut while the pressure in the sub-container is high, the sub-container can be depressurized upon cutting the partition wall.SOLUTION: A sealed container 3 includes a partition wall 30a defining a part of a storage chamber 30, and a cylindrical hanging portion 312 including a portion at which the partition wall 30a is formed. When the container 3 is opened by inserting a cutting unit 221 into the cylindrical hanging portion 312, the cutting unit 221 having a shape in which an upper side of a cylindrical portion standing parallel with the axial direction is cut to be inclined relative to the axial direction, and by cutting the partition wall 30a while the outer peripheral surface of the cutting unit is brought in close contact with the inner peripheral surface of the cylindrical hanging portion 312, a notch 221c is formed in the upper end surface of the cutting unit 221.COPYRIGHT: (C)2012,JPO&INPIT【課題】副容器に形成された隔壁を切断する切断部を容器本体側に設けておき、副容器を容器本体に装着したときに当該隔壁が切断されて、副容器に収容された内容物が容器本体内に流入するようにした複式容器において、副容器内の圧力が高い状態のまま容器本体に装着して副容器の隔壁を切断した場合であっても、隔壁が切断される際に、副容器内の圧抜きがなされるようにする。【解決手段】収容室30の一部を画成する隔壁30aと、この隔壁30aが形成された部位を含む筒状垂下部312とを備える密封された容器3を、軸方向と平行に立ち上がる円筒部の上端側を軸方向に対して斜めに切り取った形状とされた切断部221を筒状垂下部312に挿入し、切断部221の外周面が筒状垂下部312の内周面に密着した状態で隔壁30aを切断することによって開封するにあたり、切断部221の上端面に切り欠き部221cを形成する。【選択図】 図6
