A receptacle connector includes a shell, an insulating body and a plurality of terminals. The shell has a base board, two side boards and two top boards engaged with each other. A receiving recess is defined by the base board, the side boards and the top boards together. Each of the top boards defines at least one fixing opening. The insulating body has a base portion and a press plate connected with a top of the base portion. The press plate defines at least two fixing portions. The base portion is received in the receiving recess, the press plate is mounted on the top boards and the fixing portions are snapped into the corresponding fixing openings. The terminals are disposed in the base portion and stretch into the receiving recess.