A battery control device includes a plurality of voltage detection circuits that are provided so as to correspond to a plurality of battery modules constituting a battery and detect voltages of the battery modules; a plurality of communication cables that connect the voltage detection circuits in a daisy chain manner through coupling capacitors; and a control circuit that transmits and receives communication signals to and from the voltage detection circuits through the communication cables and controls the battery on the basis of the voltages received from the voltage detection circuits. Communication terminals connected to the communication cables in the voltage detection circuit are grounded through a predetermined passive circuit.