A duplex container comprises a container main body provided with a cutting unit for cutting a partition wall formed in a sub-container so that when the sub-container is mounted on the container main body, the partition wall is cut and the content contained in the sub-container flows into the container main body, wherein even if the sub-container is mounted on the container main body and the partition wall the sub-container is cut while the pressure in the sub-container is high, the sub-container can be depressurized at the time of cutting the partition wall. A sealed container (3) is provided with 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) under the state that the outer peripheral surface of the cutting unit (221) is brought in close contact with the inner peripheral surface of the cylindrical hanging portion (312), a notch (221c) is formed on the upper end surface of the cutting unit (221).Linvention porte sur un récipient « duplex », qui comprend un corps principal de récipient comportant une unité de coupe pour couper une paroi de séparation formée dans un sous-récipient, de sorte que, lorsque le sous-récipient est monté dans le corps principal de récipient, la paroi de séparation est coupée et le contenu se trouvant dans le sous-récipient sécoule dans le corps principal de récipient. Même si le sous-récipient est monté sur le corps principal de récipient et la paroi de séparation du sous-récipient est coupée pendant que la pression dans le sous-récipient est élevée, le sous-récipient peut être dépressurisé a
