A separator (4) for a fuel cell (1a) is provided which allows
effective use of heat generated in proximity to an electrolytic membrane (2)
in order to melt frozen water in the gas diffusion electrodes (3a, 3b)
of the fuel cell (1a). The separator (4) is provided with
a plurality of projections (11) between which a gas flow passage (7a,
7b) on the surface of the separator (4) is formed and
which make contact with the gas diffusion electrodes (3a, 3b).
The coefficient of thermal conductivity of the projection (11) is smaller
than the coefficient of thermal conductivity of other sections of the separator (4).
