Fuel cell

A fuel cell, comprising:

• a plurality of cells;
• an oxygen supply passage;
• and
• a fuel supply passage;
• said cells including:
• a sheet-shaped solid electrolyte having opposite surfaces, and exhibiting ion conductivity;
• at least two fuel electrodes disposed adjacent to each other on one of the opposite surfaces of said solid electrolyte, to which fuel working as a negative electrode active material is supplied;
• at least two oxygen electrodes disposed adjacent to each other on the other one of the opposite surfaces of said solid electrolyte, and electrically connected to said fuel electrodes, to which oxygen working as a positive electrode active material is supplied;
• one of said cells being held between another one of said cells neighboring thereon in a direction and still another one of said cells neighboring thereon in another direction;
• said oxygen electrodes of one of said cells facing with said oxygen electrodes of another one of said cells, neighboring thereon in a direction, so as to interpose said oxygen supply passage therebetween;
• and
• said fuel electrodes of one of said cells facing with said fuel electrodes of still another one of said cells, neighboring thereon in another direction, so as to interpose said fuel supply passage therebetween.