A closure device is provided for opening and/or re-closing a wall element, with an unlocking/locking device for opening and re-closing the wall element. A holding device is provided by which the wall element is arranged in a first function position from which it is re-closed again or by which the wall element is arranged in a second function position, from which the wall element is openably held. A control device is provided that releases a tensioning device of the unlocking/locking device. For a first release period with which the wall element is loaded with a force in the direction of the second function position. When the wall element on actuation of an actuating device is closed or arranged in the first function position and at least locks the tensioning device after the second release period when the wall element on actuating the actuating means is opened.