Abstract: A corrugated cardboard box stacking device in a corrugated cardboard box making machine wherein the space for stacking manufactured and folded corrugated cardboard boxes is divided into two of lower and upper spaces of a corrugated cardboard box storing space and a corrugated cardboard box stacking space which is positioned above and a little ahead of the storing space, and the uppermost cardboard box of a group of stacked corrugated cardboard boxes is moved by a kicker one by one to the corrugated cardboard box stacking space where a group of the corrugated cardboard boxes are moved at once to a delivery belt by a pusher bar when the number of the boxes have reached a predetermined number. The pusher bar does not affect the group of the corrugated cardboard boxes stacked in the storing space and an exact number of a group of the corrugated cardboard boxes in the stacking space can be moved at once to the delivery belt and the like.