< Topic >The damage the tablet and the like which is received to the box for packing with external impact is prevented effectively, reduction of packing materials cost and simplification of case stuffing job are assured.SolutionsAs for box S for packing, buff section 30a in order to ease impact inside side plate 14,18 of the pair which opposes and 30b were formed, buff section 30a and 30b had, from side plate 14,18, inside impingement baffle cover board 10 side of 32,33 of the abbreviation rectangular condition which distribution facilities is done and impingement baffle 32,33 side plate 14,18 and the 1st support board bottom 22 sides of 34,35 which the time tune possibly is connected and impingement baffle 32,33 side plate 14,18 and the 2nd support board 36,37 which the time tune possibly is connected and, extending facilities were done in the aforementioned 1st support board 34,35Time of flap 38,39 impingement baffle 32,33 the reduction does in inner split of the chamber body in accordance with tune operation.【課題】包装用箱に収納された錠剤等の外部衝撃による破損を効果的に防止し、包装資材コストの低減化、ケース詰め作業の容易化を図る。【解決手段】包装用箱Sは、対向する一対の側板14,18の内側に衝撃を緩和するための緩衝部30a,30bが形成され、緩衝部30a,30bは、側板14,18より、内側に配設された略矩形状の緩衝板32,33と、緩衝板32,33の蓋板10側と側板14,18と折曲可能に接続された第1の支持板34,35と、緩衝板32,33の底部22側と側板14,18と折曲可能に接続された第2の支持板36,37と、を備え、前記第1の支持板34,35に延設されたフラップ38,39の折曲動作に従い、緩衝板32,33が胴部の内方に膨縮する。