Assembled paper container

Provided is an assembled paper container capable of suppressing the difficulty of separating the container even when the container is stacked. An assembled paper container (1) according to one embodiment is provided with: a bottom surface (121); a plurality of side surfaces (122); and a flange part (13) which is connected to the plurality of side surfaces (122), and the upper surface (131) of the flange part (13) is flush after assembly. A rib section (5) is provided on a lower side surface (122) of the flange section (13), the rib section (5) having a thickness t in the height direction, and extending from the side surface (122) toward the edge of the flange section (13). 提供即使层叠也能够抑制难以分离容器的情况的组装式纸容器。一个实施方式的组装式纸容器(1)具有：底面(121)；多个侧面(122)；以及凸缘部(13)，其与多个侧面(122)连接，在组装后该凸缘部(13)的上表面(131)齐平。在凸缘部(13)的下方的侧面(122)设置有肋部(5)，该肋部(5)在高度方向上具有厚度t，从侧面(122)朝向凸缘部(13)的边缘延伸。