An electrolytic electrode comprising a substrate made of a valve metal, an intermediate layer formed on a surface of the substrate containing an oxide of at least one metal selected from the group consisting of niobium, tantalum, titanium, and zirconium, and a coating layer formed on the intermediate layer containing an iridium-tantalum mixed oxide and platinum. In separate embodiments of the invention, the intermediate layer may contain platinum and/or a stabilizing layer formed on the coating layer containing an oxide of at least one metal selected from the group consisting of tin, titanium, tantalum, zirconium, and niobium.