Fuel cell stack

A fuel cell stack formed by stacking unit fuel cells each having a membrane electrode assembly (MEA) and a pair of separators disposed on opposing sides of the MEA, the fuel cell stack comprising:

• a first separator and a second separator adhered to face each other between adjacent MEAs and each have a plurality of manifolds, a reacting region, and a guide region disposed between the plurality of manifolds and the reacting region;
• a first cooling medium guide channel guiding flow of a cooling medium between the plurality of manifolds and the first cooling surface, the first cooling medium guide channel being formed in the guide region of the first separator;
• a second cooling medium guide channel guiding flow of the cooling medium between the plurality of manifolds and the second cooling surface, the second cooling medium guide channel being formed in the guide region of the second separator;
• and
• at least portions of the first cooling medium guide channel and the second cooling medium guide channel overlapping to communicate with each other,
• wherein the first cooling medium guide channel has a first edge side guide channel extending along the edge of the guide region, a plurality of first continuous channels continued from the first edge side guide channel, and a plurality of first discontinuous channels not continued from the first edge side guide channel.