A receptacle connector used for an audio plug connector having a male end to be inserted therein, includes an insulating body, and at least one first terminal and two second terminals disposed inside the insulating body and entering the receiving cavity to contact the male end. The insulating body has an interface opened at a front end, and a receiving cavity extending backward from the interface and used for receiving the male end. The first terminal is located on a side of the male end. The two second terminals are located below or above the male end, and are approximately located on a same plane. In a height direction, two second terminals are approximately located on a same plane and only occupy a height space of one terminal.