Disclosed is a fuel cell having two or more stacked units each containing
a first separator in which a manifold and fuel gas passage section are
formed, first seal sheet which seals the first separator periphery,
membrane electrode assembly, second seal sheet which seals a second
separator periphery and second separator in which a manifold and
oxidizing gas passage section are formed, in this order, wherein each of
the fuel gas passage section and oxidizing gas passage section is in
communication with the corresponding manifold. Comb teeth structure
having comb teeth are provided between the fuel gas passage section and
manifold and between the oxidizing gas passage section and manifold in a
diffusion layer on the membrane electrode assembly, wherein slits spaces
formed between the comb teeth are in communication with the diffusion
layer.