Compact fuel cell with improved fluid supply

A fuel cell comprising:

• an electrolyte electrode assembly comprising an electrolyte and electrodes disposed one on each side of the electrolyte;
• and
• a pair of metal sheet separators sandwiching said electrolyte electrode assembly therebetween;
• said metal sheet separators having reactant gas passages for supplying a reactant gas which comprises at least a fuel gas or an oxygen-containing gas to an electrode surface of one of said electrodes of said electrolyte electrode assembly;
• said reactant gas passage being defined on at least one of said separators and having a plurality of protrusions projecting from a surface of the separator which faces one of said electrodes, and a guide rib provided by joining at least two of said protrusions, for uniformly guiding said reactant gas to said electrode surfacer,
• wherein at least said one of the metal sheet separators has:
• a coolant passage for supplying a coolant to cool said electrolyte electrode assembly;
• said coolant passage having a plurality of protrusions projecting from a surface of the separator which faces away from said reactant gas passage, and a guide rib provided by joining at least two of said protrusions, for uniformly guiding said coolant along the electrode surface,
• wherein said guide ribs projecting from both surfaces of said one of the separators include a guide rib which is continuous in an area where guide ribs overlap each other, and a guide rib which is not continuous in said area.