To provide corrugated cardboard boxes in which an irregular swell does not occur in a corrugated cardboard box body at a lower stage when they are multiply stacked in a condition where a heavy item is stored therein.

Rectangular corrugated cardboard boxes are provided, wherein, in a pair of side panels 2 and 4 and a pair of end panels 1 and 3, narrow strip-shaped cushioning areas 1x-4x are formed between each of the lateral ruled lines and lateral folding lines by providing horizontal pressing ruled lines L13-L20 in parallel to each of the lateral folding lines L5-L12 being the borders between a top face flap and a bottom face closing panel. In addition, by providing a pair of vertical pressing ruled lines L21-L24 for forming rectangular pressing ruled frames 2W and 4W jointly with a pair of lateral ruled lines in both side panels, a pair of side strip-shaped areas 2y and 4y and center rectangle areas 2z and 4z between both side strip-shaped areas are formed in the pair of the side panels.