PACKING BOX

To provide a packing box which can be prevented from being illegally unsealed with a simple structure.SOLUTION: A packing box 1 comprises: a cylindrical box main body 2 that can store an article, the box main body 2 including a back side plate 8 and a front side plate 7 opposing to the back side plate 8 and having its upper edge positioned above the back side plate 8; a lid plate 4 connected to the upper edge of the back side plate 8 to cover an upper opening 20 of the box main body 2; and a header plate 5 connected to the upper edge of the front side plate 7 to overlap a header part 29 of the front side plate 7. At least one insertion piece 12, which is inserted between the front side plate 7 and the lid plate 4, is connected to a tip edge of the header plate 5, and at least one engagement piece 13, which gets in between the front side plate 7 and the header plate 5, is connected to a tip edge 40 of the lid plate 4.SELECTED DRAWING: Figure 7 【課題】簡易に構造で不正開封を防止することが可能な包装箱の提供を目的とする。【解決手段】包装箱１は、物品を収容可能な筒状の箱本体２であって、背面板８及び背面板８と対向しかつ背面板８よりも上端縁が上方に位置する正面板７を含む箱本体２と、背面板８の上端縁に連接されかつ箱本体２の上部開口２０を覆う蓋板４と、正面板７の上端縁に連接されかつ正面板７のヘッダー部２９に重なるヘッダー板５と、を備え、ヘッダー板５の先端縁には、正面板７及び蓋板４の間に差し込まれる少なくとも一つの差込片１２が連接され、蓋板４の先端縁４０には、正面板７及びヘッダー板５の間に入り込む少なくとも一つの係合片１３が連接される。【選択図】図７