Single cell for a solid oxide fuel cell

A single cell for SOFC operating at low temperatures, excellent in generating performance and reliability even in a low-temperature region of the order of 600 to 900 DEG C, and in adhesion to a separator with low current-collecting loss when used in SOFC. The cell has a first solid electrolyte with oxide ion conductivity at 800 DEG C of 0.015 S/cm or more and bending strength of 600 MPa or more, a fuel electrode comprised of a cermet of a catalyst and a second solid electrolyte with the conductivity of 0.08 S/cm or more, bonded to one side of the first electrolyte, and an air electrode comprised of a compound of first perovskite type oxide with a third solid electrolyte, bonded to the other side optionally via an intermediate layer comprised of a fourth solid electrolyte, and the electrodes are preferably coated with fuel and air electrode contact layers, respectively.