A liquid supply device includes a first container storing liquid; a second container to which the liquid is supplied from the first container; at least one flow path to connect the first and second containers; a valve in the flow path to allow or interrupt the flow of the liquid in the flow path by opening or closing the valve; a pump provided to the flow path to transfer the liquid from the first container to the second container; and a control unit to operate the pump under a state in which the valve is opened to transfer the liquid in the first container to the second container, then close the valve and stop the pump, and then open the valve under a state in which the pump is stopped to transfer the liquid in the second container to the first container.