A closure device for closing a container comprising a closure cap with a cap cover extending radially to a closure axis and a cap skirt adjoining the cap cover on the circumferential side and extending axially, an anchor ring, a guarantee ring and a connecting element, wherein the closure device is designed and connectable to a closure base in such a way that the closure cap selectively closes an opening of the closure base by a closing movement or releases it by an opening movement and that the anchor ring remains in engagement with the closure base both in an open position of the closure cap and in a closed position of the closure cap, said connecting element connecting said closure cap to said anchor ring, the connecting element being designed in such a way that the closure cap remains connected to the anchor ring via the connecting element even after the closure cap has been opened for the first time, wherein a guiding means is provided on the cap skirt of the closure cap, which guiding means is arranged and formed in such a way that it can be brought into engagement with a corresponding guiding means on the closure base, and that the opening movement as well as the closing movement of the closure cap comprises a rotational movement of the closure cap about an axis of rotation aligned along the closure axis, wherein the anchor ring is connected to the guarantee ring via at least one tearable bridge prior to the first opening movement of the closure cap, the anchor ring, the guarantee ring and the at least one tearable bridge being designed in such a way that the at least one tearable bridge can be torn apart by the initial opening movement of the closure cap, so that the guarantee ring can be detached from the anchor ring, characterised in that the closure cap is connected to the anchor ring exclusively via the connecting element both before the first opening movement and after the first opening movement of the closure cap. a closure cap with a cap cover extending radially to a closure axis and a cap skirt adjoining the cap cover on the circumferential side and extending axially, an anchor ring, a guarantee ring and a connecting element, wherein the closure device is designed and connectable to a closure base in such a way that the closure cap selectively closes an opening of the closure base by a closing movement or releases it by an opening movement and that the anchor ring remains in engagement with the closure base both in an open position of the closure cap and in a closed position of the closure cap, said connecting element connecting said closure cap to said anchor ring, the connecting element being designed in such a way that the closure cap remains connected to the anchor ring via the connecting element even after the closure cap has been opened for the first time, wherein a guiding means is provided on the cap skirt of the closure cap, which guiding means is arranged and formed in such a way that it can be brought into engagement with a corresponding guiding means on the closure base, and that the opening movement as well as the closing movement of the closure cap comprises a rotational movement of the closure cap about an axis of rotation aligned along the closure axis, wherein the anchor ring is connected to the guarantee ring via at least one tearable bridge prior to the first opening movement of the closure cap, the anchor ring, the guarantee ring and the at least one tearable bridge being designed in such a way that the at least one tearable bridge can be torn apart by the initial opening movement of the closure cap, so that the guarantee ring can be detached from the anchor ring, characterised in that the closure cap is connected to the anchor ring exclusively via the connecting element both before the first opening movement and after the first opening movement of the closure cap.