The housing has a locking portion, which is positioned within the range between the circuits positioned at the outermost ends in the strip width direction of the flat-type conductor and is lockable to the counterpart electrical connector, and a holding space, which holds the retainer along with the front end section of the flat-type conductor, the front end section of the flat-type conductor has formed therein a pass-through portion extending through the flat-type conductor in the thickness direction of said flat-type conductor at a location at least partially overlapping with the locking portion in the strip width direction, and the retainer has a protrusion that protrudes in the thickness direction of the flat-type conductor and enters the pass-through portion of the flat-type conductor, thereby making it possible to limit the rearward movement of the flat-type conductor with the help of said protrusion.