A closure device, comprising a first closure part which includes a closure element with a base body and at least one first locking portion (222, 222A, 222B, 223, 223A, 223B) arranged on the base body, and a second closure part, which includes a base element and at least one second locking portion (302, 303) arranged on the base element, wherein the first closure part and the second closure part can be placed against each other along a placement direction, wherein in a closed position the first closure part and the second closure part are placed against each other such that the at least one first locking portion (222, 222A, 222B, 223, 223A, 223B) of the closure element and the at least one second locking portion (302, 303) of the second closure part are in engagement with each other, and wherein for releasing the first closure part and the second closure part from each other, the at least one first locking portion (222, 222A, 222B, 223, 223A, 223B) of the closure element and the at least one second locking portion (302, 303) of the second closure part can be brought out of engagement with each other by rotating the closure element relative to the second closure part about an axis of rotation, characterized in that the second closure part includes a blocking element with a blocking portion which in the closed position is arranged radially inside the at least one first locking portion (222, 222A, 222B, 223, 223A, 223B) with respect to the axis of rotation and blocks the engagement of the at least one first locking portion (222, 222A, 222B, 223, 223A, 223B) and the at least one second locking portion (302, 303) with each other, wherein the closure element includes at least one first magnetic element (230, 231) and the second closure part includes at least one second magnetic element (330, 331), wherein the at least one first magnetic element (230, 231) and the at least one second magnetic element (330, 331) are configured to cooperate in a magnetically attracting way on placement of the first closure part and the second closure part against each other. a first closure part which includes a closure element with a base body and at least one first locking portion (222, 222A, 222B, 223, 223A, 223B) arranged on the base body, and a second closure part, which includes a base element and at least one second locking portion (302, 303) arranged on the base element, wherein the first closure part and the second closure part can be placed against each other along a placement direction, wherein in a closed position the first closure part and the second closure part are placed against each other such that the at least one first locking portion (222, 222A, 222B, 223, 223A, 223B) of the closure element and the at least one second locking portion (302, 303) of the second closure part are in engagement with each other, and wherein for releasing the first closure part and the second closure part from each other, the at least one first locking portion (222, 222A, 222B, 223, 223A, 223B) of the closure element and the at least one second locking portion (302, 303) of the second closure part can be brought out of engagement with each other by rotating the closure element relative to the second closure part about an axis of rotation, that the second closure part includes a blocking element with a blocking portion which in the closed position is arranged radially inside the at least one first locking portion (222, 222A, 222B, 223, 223A, 223B) with respect to the axis of rotation and blocks the engagement of the at least one first locking portion (222, 222A, 222B, 223, 223A, 223B) and the at least one second locking portion (302, 303) with each other, wherein the closure element includes at least one first magnetic element (230, 231) and the second closure part includes at least one second magnetic element (330, 331), wherein the at least one first magnetic element (230, 231) and the at least one second magnetic element (330, 331) are configured to cooperate in a magnetically attracting way on placement of the first closure part and the second closure part against each other.