A closing device for releasably connecting two parts includes a first closing part which has a first engaging projection, and a second closing part which has a second engaging projections. The first closing part and the second closing part can be attached to each other in order to close the closing device and, in a closed position, are interconnected mechanically by the first engaging projection and the second engaging projection is in engagement with each other in a positive locking manner in the closed position. A magnetic device acting between the first closing part and the second closing part is designed to assist the attaching of the first closing part and the second closing part to each other by providing a magnetic attraction force. The first closing part has at least one first electrical contact element and the second closing part has at least one second electrical contact element.