The invention relates to a closure device, comprising a first connecting module and a second connecting module. The first connecting module can be arranged on the second connecting module in a closing direction and is mechanically latched into the second connecting module in a closed position, and the first connecting module can be released from the second connecting module by a movement of the first connecting module, or a part of the first connecting module, in an opening direction, which differs from the closing direction. To this end, a locking device (7; 9, 9a-f) is provided to prevent a movement of the first connecting module (1), or the part (1a) of the first connecting module (1), in the opening direction (Y) when the first connecting module (1) and the second connecting module (2) are in the closed position, wherein the locking device (7, 9, 9a-f) can be unlocked for moving the first connecting module (1), or the part (1a) of the first connecting module (1), in the opening direction (Y).