Closure device (1, 1A-1D) having a first closure part (2, 2A-2D) which has a body, and a second closure part (3, 3A-3D), said first closure part (2, 2A-2D) and said second closure part (3, 3A-3D) for closing the closure device (1, 1A-1D) being able to be placed against one another along a closing direction and in a closing position being connected to one another; and at least one locking element which is adjustable in relation to the body of the first closure part (2, 2A-2D); and at least one engagement portion which is shaped on the second closure part (3, 3A-3D), wherein the at least one locking element and the at least one engagement portion in a closing position are mutually engaged in such a manner that the first closure part (2, 2A-2D) and the second closure part (3, 3A-3D) are locked to one another, wherein the first closure part (2, 2A-2D) has a first magnetic installation, and the second closure part (3, 3A-3D) has a second magnetic installation, wherein the first magnetic installation and the second magnetic installation when placing the first closure part (2, 2A-2D) and the second closure part (3, 3A-3D) against one another interact in a magnetically attractive manner, and the at least one locking element is magnetically configured in such a manner that the at least one locking element in the closing position by way of the first magnetic installation and/or the second magnetic installation is loaded in the direction of engaging with the at least one engagement portion, wherein the first closure part (2, 2A-2D) has an adjustment part and an operative element which is operatively connected to the adjustment part and is rotatable about a rotation axis, wherein the adjustment part by rotating the operative element is activatable in an activation direction so as to bring the at least one locking element to disengage from the at least one engagement portion in order for the first closure part (2, 2A-2D) and the second closure part (3, 3A-3D) to be released from one another, characterized in that the engagement portion has a first oblique face which extends obliquely to the closing direction, and the first closure part (2, 2A-2D) has a second oblique face which extends obliquely to the closing direction, wherein the at least one locking element in the closing position is disposed between the first oblique face and the second oblique face. a first closure part (2, 2A-2D) which has a body, and a second closure part (3, 3A-3D), said first closure part (2, 2A-2D) and said second closure part (3, 3A-3D) for closing the closure device (1, 1A-1D) being able to be placed against one another along a closing direction and in a closing position being connected to one another; and at least one locking element which is adjustable in relation to the body of the first closure part (2, 2A-2D); and at least one engagement portion which is shaped on the second closure part (3, 3A-3D), wherein the at least one locking element and the at least one engagement portion in a closing position are mutually engaged in such a manner that the first closure part (2, 2A-2D) and the second closure part (3, 3A-3D) are locked to one another, wherein the first closure part (2, 2A-2D) has a first magnetic installation, and the second closure part (3, 3A-3D) has a second magnetic installation, wherein the first magnetic installation and the second magnetic installation when placing the first closure part (2, 2A-2D) and the second closure part (3, 3A-3D) against one another interact in a magnetically attractive manner, and the at least one locking element is magnetically configured in such a manner that the at least one locking element in the closing position by way of the first magnetic installation and/or the second magnetic installation is loaded in the direction of engaging with the at least one engagement portion, wherein the first closure part (2, 2A-2D) has an adjustment part and an operative element which is operatively connected to the adjustment part and is rotatable about a rotation axis, wherein the adjustment part by rotating the operative element is activatable in an activation direction so as to bring the at least one locking element to disengage from the at least one engagement portion in order for the first closure part (2, 2A-2D) and the second closure part (3, 3A-3D) to be released from one another, characterized in that the engagement portion has a first oblique face which extends obliquely to the closing direction, and the first closure part (2, 2A-2D) has a second oblique face which extends obliquely to the closing direction, wherein the at least one locking element in the closing position is disposed between the first oblique face and the second oblique face.