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Disclosed is a fuel cell stack comprising a fuel cell unit and separators which are stacked with each other. The separator is provided with a cooling medium supply port corresponding to a central portion of an electrode power-generating section and a cooling medium discharge port corresponding to an

Disclosed is a fuel cell stack comprising a fuel cell unit and separators which are stacked with each other. The separator is provided with a cooling medium supply port corresponding to a central portion of an electrode power-generating section and a cooling medium discharge port corresponding to an outer circumferential portion of the electrode power-generating section. The cooling medium supply port communicates with the cooling medium discharge port via a cooling medium flow passage having a spiral configuration. Accordingly, the entire fuel cell unit can be uniformly cooled, and the power-generating function can be effectively improved.

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[ What is claimed is:] [1.]1. A fuel cell stack formed by alternately stacking separators and fuel cell units each comprising a solid polymer ion exchange membrane interposed by an anode electrode and a cathode electrode, said fuel cell stack comprising:a cooling medium supply port corresponding to

[ What is claimed is:] [1.]1. A fuel cell stack formed by alternately stacking separators and fuel cell units each comprising a solid polymer ion exchange membrane interposed by an anode electrode and a cathode electrode, said fuel cell stack comprising:a cooling medium supply port corresponding to a central portion of an electrode power-generating section and a cooling medium discharge port corresponding to an outer circumferential portion of said electrode power-generating section, provided in a flat surface opposed to said anode electrode or said cathode electrode of at least one of said separators; anda cooling medium flow passage having a spiral configuration for making communication between said cooling medium supply port and said cooling medium discharge port, formed in said flat surface,wherein said cooling medium flows in a direction from said central portion to said outer circumferential portion.