A receptacle connector is disclosed. A waterproof receptacle connector according to the present invention comprises: a plurality of contacts; a support plate for covering and protecting some of the contacts; an insulator on which the contacts are installed; and a shell for containing the insulator on which the contacts are installed, wherein the shell has upper, lower, left, and right surfaces processed with no holes or pores, except for a front surface portion through which a plug connector is inserted and a rear surface portion through which the insulator is inserted, and, after the insulator is inserted through the rear surface portion of the shell, an interruption portion may be formed on the rear surface.