An electrical connector assembly is provided with an insulating housing, a PCB, and an FFC. The insulating housing includes a plurality of terminals and two side extensions The FFC and the terminals are electrically connected together by the PCB. A plurality of contacts of the PCB are provided on a top surface of the PCB. A space is defined by the extensions and two rearward inclined members on both sides of the insulating housing respectively with each rearward inclined member joining the insulating housing and the extension. The PCB is disposed in the space.