To provide a corrugated cardboard box in which a perforation for separating a flap is difficult to break when a flap is folded inside a peripheral wall. SOLUTION: At a boundary portion between upper flaps 11, 12, 13, 14 and a peripheral wall 41, a groove-like reverse ruled line 16 recessed on the front liner 1 side, and a back liner extending in parallel across an area where the reverse ruled line 16 extends are provided. A pair of groove-shaped recesses 19a, 19b recessed on the two sides are formed, and a perforation 17 for separating the upper flap is formed in the groove-shaped recess 19b, and the upper flaps 11, 12, A cardboard box in which 13 and 14 are folded inside the peripheral wall 41. [Selection] Figure 10
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