An electrical connector includes an insulating housing with a plurality of terminals disposed therein, a buckling part, and a locking element. The insulating housing has a receiving chamber penetrating through a rear thereof. The insulating housing defines two buckling grooves with rears thereof being narrower than fronts thereof, and two fixing grooves connecting with insides of the buckling grooves. The buckling part is inserted in the buckling groove, and has a base arm, a contact arm and a fixing arm having a greater width than that of the base arm to be buckled in the front of the buckling groove. The locking element is inserted in the fixing groove, and has a base board resisting against the fixing arm, a fastening portion and a hook grappling an inside of the fixing groove. The fastening portion is located between the inside of the fixing groove and the fixing arm.