To provide a technology to suppress pressure loss at end parts of a fuel cell stack with a simple and easy constitution, and stably operate the fuel cell stack.

The fuel cell stack is formed by laminating a plurality of single cells 10, respectively equipped with a cell unit 18 formed by joining a cathode 16 and an anode 14 onto both surfaces of a solid polymer electrolyte membrane, and separators 20, 22 arranged on the both faces of this cell unit 18 and having gas flow passages in order to circulate an oxidizer gas or fuel gas therethrough. In the fuel cell stack, out of the plurality of the single cells 10, surfaces of the gas flow passages of separators of end part single cells positioned at the end part regions of the fuel cell stack are treated into a surface state in which water is harder to be retained thereon than on the surfaces of the gas flow passages of the separators of the inside signal cells positioned in the inside region of the fuel cell stack.

COPYRIGHT: (C)2009,JPO&INPIT