A receptacle connector matched with a plug connector includes an insulating housing, a plurality of upper and lower terminals, a locating element and a shielding shell surrounding the insulating housing. The insulating housing defines an accommodating space, and a plurality of upper and lower terminal grooves communicating with the accommodating space. Each upper terminal disposed in the upper terminal groove has a first fastening portion, a first contact portion contacting with the plug connector, and a first soldering portion. Each lower terminal disposed in the lower terminal groove has a second fastening portion, a second contact portion contacting with the plug connector, and a second soldering portion. The locating element positioned in the accommodating space defines a plurality of through-holes aligned with the upper and lower terminal grooves respectively. The first and second soldering portions further pass through the through-holes to be soldered with a circuit board.