A connector and a connector assembly are provided by the invention. The connector includes a main body formed by a printed circuit board and a plurality of cables. The printed circuit board has a surface conductive trace layer, an inner insulation layer, a ground layer and a surface insulation layer. The surface conductive trace layer has a conductive trace pattern comprising a plurality of contacting-end pattern portions and a plurality of bonding pad portions. The inner insulation layer is located on the surface conductive trace layer. The ground layer is located on the inner insulation layer. The surface insulation layer overlays the ground layer and exposes out a part of the ground layer. The cables are electrically connected to the bonding pad portions of the conductive trace patterns.