To prevent a body-swelling of the side wall of an external box from arising by a method wherein the length of the apparent outer periphery of an internal cylinder is made approx. the same length as the length of a circle which inscribes the internal dimension of the external box, and the height direction of the internal cylinder is made a height which does not exceed the internal dimensional height of the external box.

For this liquid packaging container R1, in an approx. equilateral square external box A1 comprising body parts A11, A13, a cylindrical internal cylinder B1 made of one-sided corrugated fiberboard sheet is fitted. The internal cylinder B1 is formed by bonding both ends of the one-sided corrugated fiberboard sheet, and the length of the outer periphery of the cylindrical shape is made approx. the same as the length of the circumference which inscribes the external box A1. In the liquid packaging container R1, an internal bag P1 made of a plastic being rich in flexibility is housed. The outer peripheral length of the internal cylinder B1 is approx. the same length as the length of the circumference which inscribes the external box A1. By this method, a body swelling of the liquid packaging container R1 can be prevented from arising.