In order to obtain a paper container which can be easily opened through depression of the top part of a body panel with a small force when opening the paper container, a downward curved first auxiliary folding line 43 is formed on an opening-side body panel 7 of a gable roof-type paper container continuing to an opening-side gable wall-forming panel 23 via a top horizontal folding line 25, with the first auxiliary folding line being arranged such that the ends 41, 42 thereof connect between intersections 39 of ends of body vertical folding lines 3, 4 on both sides of the opening-side body panel 7 with ends of the top horizontal folding line 25, or between positions near the intersections 39, and a second auxiliary folding line 58 vertically extending through a lateral center part is formed on a substantially triangular surface part 36 of the opening-side gable wall-forming panel,...

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