A communication system in which a power feeding device is connected to a vehicle, the vehicle having an electric storage device configured to receive power from the power feeding device by two cables (33, 34), communication of a control signal, required for charge control of the electric storage, device, being performed through the cables, the communication system being characterized in that: the power feeding device includes a charge control unit including a rectangular-wave oscillation circuit and a microcomputer, and one of the power feeding device and the vehicle includes: a first superimposing/separating unit (22, 15), connected to two branch lines (33a, 34a, 33b, 34b) branched from the two cables respectively, configured to perform superimposition of a communication signal different from the control signal onto communication through the cables, and configured to perform separation of the communication signal superimposed onto the communication through the cables; and a first communication unit (23, 14), configured to transmit and receive a communication signal through the first superimposing/separating unit, and that another one of the power feeding device and the vehicle includes a second superimposing/separating unit (13, 24) located in one of the cables, which is configured to perform superimposition of the communication signal onto communication through the cable and to perform separation of the communication signal superimposed onto the communication through the cable; and a second communication unit (14, 23) configured to transmit and receive a communication signal through the second superimposing/separating unit. the power feeding device includes a charge control unit including a rectangular-wave oscillation circuit and a microcomputer, and one of the power feeding device and the vehicle includes: a first superimposing/separating unit (22, 15), connected to two branch lines (33a, 34a, 33b, 34b) branched from the two cables respectively, configured to perform superimposition of a communication signal different from the control signal onto communication through the cables, and configured to perform separation of the communication signal superimposed onto the communication through the cables; and a first communication unit (23, 14), configured to transmit and receive a communication signal through the first superimposing/separating unit, and that a first superimposing/separating unit (22, 15), connected to two branch lines (33a, 34a, 33b, 34b) branched from the two cables respectively, configured to perform superimposition of a communication signal different from the control signal onto communication through the cables, and configured to perform separation of the communication signal superimposed onto the communication through the cables; and a first communication unit (23, 14), configured to transmit and receive a communication signal through the first superimposing/separating unit, and that another one of the power feeding device and the vehicle includes a second superimposing/separating unit (13, 24) located in one of the cables, which is configured to perform superimposition of the communication signal onto communication through the cable and to perform separation of the communication signal superimposed onto the communication through the cable; and a second communication unit (14, 23) configured to transmit and receive a communication signal through the second superimposing/separating unit.