A corrugated cardboard box is provided in which a perforation is not easily broken when a flap is folded along the perforation. On a groove-like reverse ruled line 16 in which the side of the front liner 1 is recessed, a perforation 17 comprising a number of cuts 31 passing through between the side of the back liner 2 and the side of the front liner 1 is formed. The perforation 17 has a width W1 of each cut 31a on the side of the front liner 1 in the direction orthogonal to the direction in which the perforation 17 extends, and the width on the back liner 2 in the direction orthogonal to the direction in which the perforation 17 extends. It is formed to be smaller than the width W2 of the cut line 31b. [Selection] Figure 2
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