Abstract: A paper container includes four body portion panels forming a cylindrical body portion having a square section. The paper container is configured so that upper ends of the body portion panels are continuously provided with a pair of gable roof-forming panels which include exterior top seal panels opposed to each other, and provided with a pair of gable wall-forming panels which include interior top seal panels opposed to each other. Any one of the panels serves as a spout and is to be opened. The gable wall-forming panels are folded out between the gable roof-forming panels, and the exterior top seal panels and the interior top seal panels are heated and sealed with each other at a predetermined position so as to be hermetically sealed.

Abstract: Provided is a paper container including four body portion panels (4, 5, 6, 7) forming a cylindrical body portion having a square section, the paper container being configured so that upper ends of the body portion panels are continuously provided with a pair of gable roof-forming panels (13, 14), which include exterior top seal panels (17, 18) and are opposed to each other, and provided with a pair of gable wall-forming panels (21, 22), which include interior top seal panels (25, 26) and are opposed to each other, and any one of which serves as a spout and is to be opened, the gable wall-forming panels (21, 22) are folded out between the gable roof-forming panels (13, 14), and the exterior top seal panels (17, 18) and the interior top seal panels (25, 26) are heated and sealed with each other at a predetermined position so as to be hermetically sealed, in which: a seal width on a non-opening side (B) of a top seal portion (30), which is formed by heating and sealing the exterior top seal panels (17, 18) and t