An electrode plate for electrolysis is composed of a plate-form porous ceramic body for electrolyzing a hydrogen-comprising-compound solution, and a conductive portion provided at a part of the ceramic body, wherein particles for composing the ceramic body are comprised of any of fluoride carbon and an element difficult to react to oxygen, and wherein an outmost-nucleus-orbit electron number of the element is even, and porosity having an energy concentration field is provided between the particles in the ceramic body.