Problem to be solved: to provide a packaging box and a blank sheet having a structure in which the opening and closing indication is automatically exposed by the opening or resealing function, and the function is not damaged even if the function is resealed.Four side platesA connecting plate for maintaining a cylinder comprising four side platesProvided with a sealing plate for sealing the cylindrical openingSaid apertureEquipped with three blockages extending from the edges of the three sidesProvided with a support plate folded from the edge of the remaining side to the back side of the side plateThe center of the blockade isContact the edge of the side plate to which the sealing plate extends and the edge of the side plateEquipped with an insertion plate inserted into the back side of the facing side plate to the tipThe facing side plate and support plate areIt is equipped with a separation part surrounded by a cut line leading to both regionsThe insertion plate and the support plate areIt is adhered only in the region of the withdrawal part.Said departure portionA packaging box with resealing function detachably from the front side plate and the support plate integrally with the insertion plate at the time of opening.Diagram【課題】 開封又は再封機能の発揮によって自動的に開封表示が露出する構成を備え、その機能が再封時にあっても損なわれない包装用箱及びそのブランクシートの提供。【解決手段】 四側板と、当該四側板からなる筒状を維持する連結板と、当該筒状の開口部を封じる封鎖板を備え、前記開口部は、三つの側面の端縁から各々延出する三つの封鎖板を備え、残る一つの側面の端縁から当該側板の裏側へ折り重ねられた支持板を備え、中央に位置する封鎖板は、当該封鎖板が延出する側板の端縁とその対面側板の端縁とを連絡し、その先端に対面側板の裏側に挿し入れられる挿込板を備え、前記対面側板及び支持板は、両者の領域に連なる切込線に囲まれた離脱部を備え、前記挿込板と前記支持板は、前記離脱部の領域のみで貼着され、前記離脱部は、開封時に前記挿込板と一体となって前記対面側板及び支持板から離脱する再封機能付き包装用箱。【選択図】 図１
