Paper container

A paper container, comprising:

• a body front panel, a body right side panel, a body left side panel, and a body back panel, the body front panel and the body right side panel being contiguous with each other through a first body vertical folding line, the body front panel and the body left side panel being contiguous with each other through a second body vertical folding line, the body back panel and the body right side panel being contiguous with each other through a third body vertical folding line, and the body back panel and the body left side panel being contiguous with each other through a fourth body vertical folding line;
• a vertical direction sealing panel configured to form a quadrangular tubular body;
• a first top panel contiguous with an upper end of the body front panel and a second top panel contiguous with an upper end of the body back panel, the first and second top panels being opposed to the body front panel and the body back panel through first top portion horizontal folding lines, respectively;
• a pair of side panels contiguous with an upper end of the body right side panel and an upper end of the body left side panel so as to be opposed to the body right side panel and the body left side panel through second top portion horizontal folding lines, respectively, the first and second top panels and the pair of side panels being folded inward and sealed so as to be tightly closed to form a top portion of the paper container;
• and
• a first bottom panel contiguous with a lower end of the body front panel and a second bottom panel contiguous with a lower end of the body back panel, the first and second bottom panels being opposed to the body front panel and the body back panel through first bottom portion horizontal folding lines, respectively;
• and
• a pair of inner panels contiguous with a lower end of the body right side panel and a lower end of the body left side panel so as to be opposed to the body right side panel and the body left side panel through second bottom portion horizontal folding lines, the first and second bottom panels and the pair of inner panels being folded inward and sealed so as to be tightly closed to form a bottom portion of the paper container,
• wherein the top portion has an inclined surface which is lower on a body front panel side of the paper container and higher on a body back panel side of the paper container,
• wherein the inclined surface has an opening, and a spout is provided at the opening,
• wherein the first body vertical folding line and the second body vertical folding line are approximately symmetrical bent lines which are bent inward toward a center of the body front panel, and the third body vertical folding line and the fourth body vertical folding line are approximately symmetrical bent lines which are bent inward toward a center of the body back panel,
• wherein a most inward point on each of the first, second, third and fourth body vertical folding lines is located above a center of the body front panel and a center of the body back panel in a vertical direction,
• wherein the body left side panel has a first recessed surface in a region between the most inward point on the second body vertical folding line and the most inward point on the fourth body vertical folding line, the first recessed surface being bent inward in accordance with an angle at which the second body vertical folding line and the fourth body vertical folding line are bent, and
• wherein the body right side panel has a second recessed surface in a region between the most inward point on the first body vertical folding line and the most inward point on the third body vertical folding line, the second recessed surface being bent inward in accordance with an angle at which the first body vertical folding line and the third body vertical folding line are bent.