To provide a solid polymer type fuel cell stack capable of realizing uniform humidification and cooling within a reaction surface of a cell and reducing a production cost of a separator.

An electricity generation portion 100a of the fuel cell stack is composed of a plurality of unit cells 101 laminated. Each of the unit cells 101 is composed of a membrane electrode assembly (MEA) 105 holding a solid polymer electrolyte membrane 102 with an anode gas diffusion electrode 103 and a cathode gas diffusion electrode 104, and a separator 106. The separator 106 is a member which has flow path grooves on a primary surface opposing to a conductive porous carbon plates and the flow path grooves form a fuel gas flow path 103c and a oxidizer gas flow path 104c which contact with the MEA. A shape of the primary surface of the separator 106 is rectangular and a side of the separator of a long side thereof contact with cooling water flowing in a cooling water flow path 107c of a perpendicular direction formed in a side cooling water manifold 150 and 160.

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