Electrochemical reduction processes of oxides and injected CO₂ in molten salt have been paid much attention as the carbon free technology to achieve the SDGs. We focused on La_1−xSr_xFeO_3−δ materials to utilizing O₂ evolution electrode, because they intrinsically possess both oxygen ion conductivity and electron conductivity at elevating temperatures. Unfortunately, the properties have not been well examined in the molten salt despite the fundamental characteristics for the application to the inert anode. We found that La_1−xSr_xFeO_3−δ electrodes had excellent chemical and physical stability for keeping stable oxygen evolution reaction in the molten chlorides at 723 K.