Fuel cell stack

A fuel cell stack comprising:

• a plurality of power generation units stacked in a stacking direction to provide a stacked body and each comprising:
• a first separator;
• a first electrolyte electrode assembly provided on the first separator;
• a second separator provided on the first electrolyte electrode assembly;
• a second electrolyte electrode assembly provided on the second separator, the first electrolyte electrode assembly and the second electrolyte electrode assembly each including an electrolyte and a pair of electrodes sandwiching the electrolyte therebetween;
• and
• a third separator provided on the second electrolyte electrode assembly;
• a reactant gas channel through which a reactant gas is to flow along a power generation surface and which is provided between the first separator and the first electrolyte electrode assembly, between the first electrolyte electrode assembly and the second separator, between the second separator and the second electrolyte electrode assembly, and between the second electrolyte electrode assembly and the third separator;
• a coolant channel which is provided between the plurality of power generation units and through which a coolant is to flow;
• and
• the stacked body having the second separators at one end and at another end opposite to the one end of the stacked body in the stacking direction, respectively.