An electrical receptacle connector includes an insulated housing, a plurality of receptacle terminals, and a metallic shell. A hollow portion is between a first main body and a second main body of the base portion of the insulated housing, and body portions of the receptacle terminals penetrate the first main body and the second main body and are exposed out of the hollow portion. The metallic shell covers the insulated housing and covers the hollow portion to form an enclosed space in the hollow portion. The metallic shell has a potting hole corresponding to the enclosed space. When a sealing body is poured into the potting hole, the sealing body is provided between the insulated housing and the receptacle terminals and is also provided between the metallic shell and the insulated housing. Hence, waterproof function of the connector can be achieved.