A flat-bonded paper container and paper for use therewith are provided. A paper container has a top marginal region (52). The upper edge portion is configured to join the plurality of first folding units 70 and the plurality of second folding units 80 . The first folding unit has an overlapping first top portion 72, a first bottom portion 73 and two connecting portions 71 located at the ends of each end. The inner long side 721 of the first top also includes two joints located at the two connection sites. The second folding unit has a second top portion 81 and a second bottom portion 82 which overlap. The second bottom has two protruding portions 821 protruding from the two short sides 813 of the second top. The connection part of each first folding unit is folded and overlapped with the two protruding parts of the second folding unit, and the joining point of the inner long side of each first top is joined to the short side of the second top. Since the upper marginal portion has good structural strength and there is no level difference in the joining portion, the upper marginal portion and the plastic film or the vacuum shrinkable film can be brought into close contact and fixed. [Selection drawing] Fig. 4【課題】平坦に接合された紙容器およびそれに使う紙を提供する。【解決手段】紙容器は上端辺縁部位52を有する。上端辺縁部位は複数の**折り畳みユニット70および複数の第二折り畳みユニット80を接合する構成とする。**折り畳みユニットは重なる**頂部72、**底部73および両端の末端部に位置する二つの連結部位71を有する。**頂部の内側長辺721は二つの連結部位に位置する二つの接合箇所も含む。第二折り畳みユニットは重なる第二頂部81および第二底部82を有する。第二底部は第二頂部の二つの短辺813に突出した二つの突出部位821を有する。それぞれの**折り畳みユニットの連結部位は第二折り畳みユニットの二つの突出部位に畳まれて重なり、それぞれの**頂部の内側長辺の接合箇所は第二頂部の短辺に接合される。上端辺縁部位は構造強度が良好であり、接合箇所に段差がないため、上端辺縁部位とプラスチックフィルムまたは真空収縮フィルムとを密着させて固定することができる。【選択図】図4