Abstract: A plug-in connecting system for flexible conductor films with film-insulated conductors, including a plug-in unit and a counter plug-in unit, which are each provided on a terminal zone of the conductor film and adapted to be inserted into each other for the purpose of establishing an electrical contact of said film-insulated conductors. The plug-in unit and the counter plug-in unit each have a base body and a top which can be brought into an intimate solid contact via a fixing mechanism in said base body, and that at least one penetration structure is provided between said base body and said top, into which a film-insulated conductor of the terminal zone of the conductor film can be inserted before a contact is established between said top and said base body and which penetrates, at least partly, said film-insulated conductor for fixing and establishment of an electrical contact exclusively by pressing said top against said base body.