The invention discloses a plug connector, which includes an insulative body, an electrical assembly, an optical fiber assembly and deflectable latches. The insulative body is provided with a housing which passes forward through the front end face of the insulative body and is used for connection to an external object in a front-to-back direction. A plurality of passageways are in interval arrangement with the housing in a vertical direction perpendicular to the front-to-back direction. The electrical assembly is received in the housing and includes a printed circuit board and a plurality of terminals connected on the printed circuit board, wherein the contact part of each terminal extends into a corresponding passageway and joints to the external object in a vertical direction. The optical fiber assembly is received in the housing and is arranged on an insulative housing located at one end opposite to the plurality of terminals. The optical fiber assembly includes a base block and at least one cap pivotally mounted thereon, a pair of through holes formed in the base block, a pair of mating sleeves disposed in the corresponding through holes, and each mating sleeve receive a GRIN lens and a guide-in glass cylinder. The GRIN lens is positioned in front of the guide-in glass cylinder.