NOVELTY - An electrolysis cell consists of an electroconductive support material (1), an interconnector (8), and an intermediate layer (7). The electroconductive support material contains nickel, and has an electrode layer (3) containing nickel provided in main surface opposing a solid electrolyte layer (4) and an electrode layer (6) provided in other main surface of solid electrolyte layer. A complex oxide containing lanthanum and zirconium remains dispersed in the intermediate layer.    USE - Electrolysis cell is used for forming electrolysis cell stacked apparatus for electrolysis module used in electrolyzer (all claimed) used for producing hydrogen and oxygen, and as solid oxide fuel cell.    ADVANTAGE - The electrolysis cell has excellent electric power generation performance and electroconductivity between interconnector and electroconductive support material, due to the presence of fuel gas in the interconnector.    DETAILED DESCRIPTION - An electrolysis cell consists of an electroconductive support material, an interconnector, and an intermediate layer. The electroconductive support material contains nickel, and has an electrode layer (3) containing nickel provided in main surface opposing a solid electrolyte layer and an electrode layer (6) provided in other main surface of solid electrolyte layer. The interconnector is provided on electroconductive support material and connected electrically to the electrode layer (3), and contains lanthanum. The intermediate layer is provided between the electroconductive support material and the interconnector, and contains zirconium and nickel. A complex oxide containing lanthanum and zirconium remains dispersed in the intermediate layer. INDEPENDENT CLAIMS are included for the following:    (1) electrolysis cell stacked apparatus;    (2) electrolysis module; and    (3) electrolyzer.    DESCRIPTION OF DRAWING(S) - The drawing shows the cross-sectional view of solid oxide fuel cell.    Electroconductive support material (1)    Electrode layers (3,6)    Solid electrolyte layer (4)    Intermediate layer (7)    Interconnector (8)    Solid oxide fuel cell (10)    Lanthanum-diffusion acceleration layer (17)