A branch connection structure includes a flexible flat cable (FFC)(21) and connection terminals (22) attached to the middle of the FFC. The FFC comprises conductive strips (23) arranged in parallel to each other at a predetermined interval, and a pair of insulating films (24) sandwiching the conductive strips. One or more slits (25) extend between any two adjacent conductive strips to define a plurality of separated regions (27) in the middle of the FFC, each region including one of the conductive strips. The connection terminal has conductive teeth (31) and a pair of retainers (30) positioned on both sides of the conductive teeth. The conductive teeth pierce through the conductive strip of the separated region from the rear surface of the FFC, and the tips of the conductive teeth are bent so as to pierce again into the conductive strip from the top surface of the separated region. The retainers firmly hold the separated region at both sides of the conductive teeth without touching the conductive strip, and the FFC is folded back at the terminal connectors.