PURPOSE: To obtain a folded-type corrugated board packing having an approximately parapelloid shape foldable from a single piece of fiberboard by providing a product fitting recess with a plurality of buffer ribs applied on an outer periphery.

CONSTITUTION: This corrugated board comprises outer wail pieces 2, 3 to be outer wall faces of a packing respectively connected via a main fold A to right and left sides of a bottom piece 1 provided with a plurality of standing curs H (fold I for standing) for forming a plurality of buffer ribs 12 in a cut standing state, top faces 4, 5 of the packing and recess forming pieces 10, 11 for bent-forming a fitting recess S connected via folds F, G to both sides. Both outer wall pieces are equipped with stand aiding pieces 14 having a standing fold I tilted 45 degrees so that they are connected no both ends of each buffer rib, while the recess forming piece 10 is equipped with a cur 15 and folds J, K for forming a buffer rib 12A. A buffer slit 20 may be provided on ridges of top faces 4, 5 of the packing.