An electrical receptacle connector includes a metallic shell, an insulated housing, first and second groups of terminals, an adapting circuit board, and extension terminals. The insulated housing is received in the metallic shell and includes a base portion, upper and lower tongue portions, and a partition plate. Upper and lower plug openings are respectively formed between the partition plate and the upper portion of the metallic shell and between the partition plate and the lower portion of the metallic shell. The terminals are held in the insulated housing. The adapting circuit board is disposed at the rear of the insulated housing and includes an upper-row contact set connected to the first group of terminals and a lower-row contact set. One ends of the extension terminals are connected to the lower-row contact set, and the other ends of the extension terminals are extended to the bottom of the insulated housing.