A closure device for releasably connecting two parts with each other, comprising - a first closure member (2, 2a-2d) having a rigid first locking protrusion and - a second closure member (3, 3a-3d) which is attachable to the first closure member (2, 2a-2d) and in a closed position is held on the first closure member (2, 2a-2d), the second closure member (3, 3a-3d) having a rigid second locking protrusion, wherein the second locking protrusion can be brought into engagement with the first locking protrusion in an engagement direction and in the closed position engages the first locking protrusion in a positive locking manner, wherein - the first closure member (2, 2a-2d) comprises a first magnetic member (23, 23A, 23B) and the second closure member (3, 3a-3d) comprises a second magnetic member (33, 33A, 33B), the first magnetic member (23, 23A, 23B) and the second magnetic member (33, 33A, 33B) being constituted to magnetically attract each other when the second closure member (3, 3a-3d) is attached to the first closure member (2, 2a-2d) for closing the closure device, - the first closure member (2, 2a-2d) comprises a base and a locking element (21, 21A, 21B) rigidly attached to the base and carrying the first locking protrusion, wherein the second closure member (3, 3a-3d) comprises a locking part (30, 30A, 30B) carrying the second locking protrusion and having a front face which in the closed position faces the locking element (21, 21A, 21B) of the first closure member (2, 2a-2d) and - a force application element in the form of a strap or belt (31, 31a-31d) attached to the second closure member (3, 3a-3d) at a force application location in the vicinity of the second locking protrusion, the force application element (31, 31a-31d) being constituted to introduce a force into the second closure member (3, 3a-3d) and being adjustably attached to the second closure member (3, 3a-3d) in such a way that a length of the strap or belt (31, 31a-31d), being defined as the extension of the strap or belt (31, 31a-31d) from the second closure member (3, 3a-3d), may be adjusted at the second closure member (3, 3a-3d), wherein the force application element (31, 31a-31d) is adjustably attached to the second closure member (3, 3a-3d) via a) a ladderlock or buckle element at a middle portion of the second closure member (3, 3a-3d) at which the force application element in the form of the strap or belt (31, 31a-31d) is deflected at least once, or b) a clamp element of the second closure member (3, 3a-3d) which may clamp a section of the force application element in the form of the strap or belt (31, 31a-31d) in a force-fitting and/or form-fitting manner. - a first closure member (2, 2a-2d) having a rigid first locking protrusion and - a second closure member (3, 3a-3d) which is attachable to the first closure member (2, 2a-2d) and in a closed position is held on the first closure member (2, 2a-2d), the second closure member (3, 3a-3d) having a rigid second locking protrusion, wherein the second locking protrusion can be brought into engagement with the first locking protrusion in an engagement direction and in the closed position engages the first locking protrusion in a positive locking manner, wherein - the first closure member (2, 2a-2d) comprises a first magnetic member (23, 23A, 23B) and the second closure member (3, 3a-3d) comprises a second magnetic member (33, 33A, 33B), the first magnetic member (23, 23A, 23B) and the second magnetic member (33, 33A, 33B) being constituted to magnetically attract each other when the second closure member (3, 3a-3d) is attached to the first closure member (2, 2a-2d) for closing the closure device, - the first closure member (2, 2a-2d) comprises a base and a locking element (21, 21A, 21B) rigidly attached to the base and carrying the first locking protrusion, wherein the second closure member (3, 3a-3d) comprises a locking part (30, 30A, 30B) carrying the second locking protrusion and having a front face which in the closed position faces the locking element (21, 21A, 21B) of the first closure member (2, 2a-2d) and - a force application element in the form of a strap or belt (31, 31a-31d) attached to the second closure member (3, 3a-3d) at a force application location in the vicinity of the second locking protrusion, the force application element (31, 31a-31d) being constituted to introduce a force into the second closure member (3, 3a-3d) and being adjustably attached to the second closure member (3, 3a-3d) in such a way that a length of the strap or belt (31, 31a-31d), being defined as the extension of the strap or belt (31, 31a-31d) from the second closure member (3, 3a-3d), may be adjusted at the second closure member (3, 3a-3d), wherein the force application element (31, 31a-31d) is adjustably attached to the second closure member (3, 3a-3d) via a) a ladderlock or buckle element at a middle portion of the second closure member (3, 3a-3d) at which the force application element in the form of the strap or belt (31, 31a-31d) is deflected at least once, or b) a clamp element of the second closure member (3, 3a-3d) which may clamp a section of the force application element in the form of the strap or belt (31, 31a-31d) in a force-fitting and/or form-fitting manner. a) a ladderlock or buckle element at a middle portion of the second closure member (3, 3a-3d) at which the force application element in the form of the strap or belt (31, 31a-31d) is deflected at least once, or b) a clamp element of the second closure member (3, 3a-3d) which may clamp a section of the force application element in the form of the strap or belt (31, 31a-31d) in a force-fitting and/or form-fitting manner.