The present invention provides a redox flow battery including an ion-exchange membrane, a liquid inflow layer, an electrode, and a current collector plate so as to be stacked in this order. The electrode includes a plurality of electrode pieces which are disposed in parallel in a plane direction, a liquid supply passage for supplying an electrolytic solution to the liquid inflow layer is provided between the adjacent electrode pieces, and the electrolytic solution passes through the electrode from an ion-exchange membrane side surface of the electrode to a current collector plate side surface.