CORRUGATED FIBERBOARD BOX

PROBLEM TO BE SOLVED: To make it harder for space of top and bottom gaps to occur in a corrugated fiberboard box, even if a liquid storage container accommodated in the corrugated fiberboard box is more contracted than when accommodated in the box.SOLUTION: There are provided a corrugated fiberboard box body 2 for accommodating the liquid storage container 1 made of resin and flaps 5 connected to upper edges 3 of the corrugated fiberboard box body 2 so as to be able to be vertically opened and closed and freely oscillate. Out of the flaps 5, a pair of outer flaps 6 folded at the upper edges 3 facing each other to be positioned outside are associated each other with their ends so as to be able to close inner space of the corrugated fiberboard box body 2. Between the ends of the outer flaps 6 and the upper edges 3, intermediate folding parts 8 along the upper edges 3 are formed. In a state that the upper edges 3 and the intermediate folding part 8 are both folded, and in a state that surfaces of flap bases 10 between the upper edges 3 and the intermediate folding parts 8 are inclined, the ends of the pair of outer flaps 6 meet each other.