A plug connector assembly includes: a cable; a printed circuit board including a mating end for inserting into a mating connector, a connecting end electrically connected with the cable, and an intermediate portion between the mating end and the connecting end, the mating end defining plural conductive pads extending along a longitudinal direction of the printed circuit board for electrically connecting with the mating connector and arranged in a horizontal direction perpendicular to the longitudinal direction; and an outer case enclosing the intermediate portion of the printed circuit board and a part of the cable; wherein the intermediate portion defines on each of two side edges thereof a recessing portion filled by the outer case.