FUEL BATTERY STACK

A fuel battery stack includes: fuel battery cells including a first anode electrode and a first cathode electrode on both surfaces of a first electrolyte, the first anode electrode and the first cathode electrode each constituting plural electrode regions divided by division grooves, a plurality of unit cells being constituted by a stacking structure including one electrode region on one surface side of the both surfaces, one electrode region on the other surface side facing the one electrode region, and the first electrolyte, these unit cells being connected in series, a second fuel battery cell including a second anode electrode and a second cathode electrode on both surfaces of a second electrolyte and includes a second conductive portion penetrating the second electrolyte to short-circuit between the second anode and cathode electrode; and a non-conductive separator dividing the first fuel battery cells and the second fuel battery cell, respectively.