An electric connector having a housing in which there are disposed, side by side, a plurality of wire holding portions for holding the insulations of insulated wires. Each wire holding portion has: a pair of wire holding pieces disposed as facing each other to form a wire holding groove; and wire hold-down pieces not only for guiding, in the vertical direction, the insertion of the insulated wire into the wire holding groove, but also for preventing the insulated wire from coming off from the wire holding groove. The plurality of wire holding portions has: a first wire holding portion having wire hold-down pieces at a first wire hold-down position; and a second wire holding portion disposed adjacent to the first wire holding portion, and having wire hold-down pieces at a second wire hold-down position different from the first wire hold-down position.