An implantable nerve electrode is provided that comprises an electrically insulating substrate with conductor traces running therein, electrode contacts and connection contacts, wherein the conductor traces connect the electrode contacts to the connection contacts, and wherein the electrode contacts can be connected to the nerves of a nervous system, each of the conductor traces having an at least partial sheathing made of a polymer that is mechanically strong and a good insulator. Also provided is a method for producing an implantable nerve electrode.