A cable assembly includes a plurality of cables arranged along an arrangement orientation and a connector connected to the plurality of cables. Each cable includes a conductive signal wire, a drain wire, an insulating inner sheath covering the signal wire, a conductive outer conductor covering the inner sheath, and an insulating outer sheath. The connector includes a plurality of conductive signal contacts, one or more conductive ground contacts located between adjacent signal contacts, and a conductive ground bar extending along the arrangement orientation. The ground bar includes connection pieces connected to the ground contacts. The plurality of signal contacts are connected to a plurality of signal wires exposed of the plurality of cables. The ground bar comprises a facing surface that faces outer circumferential surfaces of a plurality of inner sheaths exposed of the plurality of cables, and a plurality of drain wires are connected to the facing surface.