Abstract: An I/O connector includes a housing, an insulating body and a plurality of terminals. The housing has a recess for receiving the insulating body. The insulating body defines fixing cavities on a bottom surface thereof and fixing grooves on a back surface thereof for receiving the terminals. The terminal has a fixing portion. One end of the fixing portion bends to form a soldering portion and the other end of the fixing portion bends sideward to form a bent portion. The end of the bent portion extends downward and separates into two elastic arms. Free ends of the two elastic arms bend toward two reverse directions respectively and then bend reversely to approach each other again to form two contact portions, whereby an opposite elasticity is generated to provide a firm engagement with a printed circuit board and to prevent transmission from cutting off while being shocked.