While efficient assembly performance of an electrical connector is obtained, good operability can be also obtained by a simple configuration. Good shielding performance with respect to transmission paths are configured to be obtained by a simple configuration in which movement of an actuator causes both shield shells to contact each other by covering at least part of outer surfaces of an insulating housing and the actuator by the shield shells consisting of electrically-conductive metal members, causing the actuator-side shield shell moved to an action position to contact the insulating-housing-side shield shell, and continuously covering the transmission paths, which are from a signal transmission medium to a printed wiring board through electrically-conductive contact members.