Closure Device and Packaging Comprising a Closure Device

A closure device for attaching to a packaging container, by which the packaging container is closable and can be reclosed but cannot be opened by children, wherein the closure device is made of at least 70% paper-based material and comprises a tab receptacle delimiting a receiving space and an insertion tab having a hook element , wherein to close the closure device , the insertion tab is inserted in the receiving space of the tab receptacle, and a free end of the hook element of the insertion tab lockingly engages with an edge of the receiving space, and in order to open the closure device, the insertion tab is withdrawn from the receiving space only when simultaneous pressure is applied to the hook element to release the lock, wherein for this purpose an opening is formed in a wall of the tab receptacle near the edge, through which opening pressure can be applied to the hook element in such a way that the free end of the hook element is released from locking.