A receptacle connector includes an insulating housing with a plurality of openings apart opened in a front face thereof. A terminal group includes a ground terminal embedded in the insulating housing. The terminal group has a plurality of contact slices molded in the insulating housing and exposed through the openings respectively, and a plurality of touching arms elastically stretching outside the insulating housing. At least one connecting member is molded in the insulating housing to electrically connect with the ground terminal, and has a connecting slice exposed outside and abreast with the front face of the insulating housing. A metal shell is mounted to the front face of the insulating housing and point welded with the connecting slice. A window is opened in the metal shell and located to face the openings for further exposing the contact slices therethrough. A waterproof washer is sealed around the metal shell.