Abstract: A flat cable connecting device which is conveniently used where a flat cable must be passed through a slit formed in a partition wall in order to establish connection thereof with connector pins. The flat cable connecting device includes a flat cable of essentially uniform width having a plurality of printed wires printed thereon. A small hole at one end of the flat cable extends through one of the printed wires for receiving one of the connector pins located on a printed circuit board, thereby establishing mechanical and electrical connection between the flat cable and the printed circuit board. A plurality of printed wire connecting sections are located at one or more edges of the flat cable and electrically connected to the corresponding printed wires, while a plurality of conductor sections are printed on the printed circuit board for electrically connecting the printed wire connecting sections to the corresponding connector pins.