Abstract: The invention relates to an insulation body of a plug-in connector that consists of a plug body (10), in which contact elements (11) are provided, and which consists of a connection body (20), which in turn has connection elements (21) that can be electrically connected to conductor tracks of a circuit board and/or to individual wires of a multi-wired cable to be connected, wherein the plug body (10) and the connection body (20) can be mated together, as a result of which the contact elements (11) can be electrically contacted with the connection elements (21) of the connection body (20).