Cell for fuel cell and fuel cell

A cell for a fuel cell, comprising an assembly having a fuel electrode and an air electrode provided on an electrolyte membrane, a first gas diffusion member that supplies a fuel gas to the fuel electrode, a second gas diffusion member that supplies an oxidizing gas to the air electrode, and a pair of separators that sandwich the first gas diffusion member, the assembly, and the second gas diffusion member, wherein:

• the cell for a fuel cell has an electric power generation region in which the assembly is positioned, a first manifold region, which is provided at a periphery of the electric power generation region, and in which first manifold openings are formed to allow passage of the fuel gas, and a second manifold region, which is provided at the periphery of the electric power generation region, and in which second manifold openings are formed to allow passage of the oxidizing gas,
• the first gas diffusion member extends to the first manifold region and is hermetically sealed by impregnation with a liquid resin,
• the second gas diffusion member extends to the second manifold region and is hermetically sealed by impregnation with a liquid resin,
• a porosity of a first boundary portion between the electric power generation region and the first manifold region in the first gas diffusion member is smaller than a porosity of the manifold region within the first gas diffusion member,
• a porosity of a second boundary portion between the electric power generation region and the second manifold region in the second gas diffusion member is smaller than a porosity of the second manifold region within the second gas diffusion member,
• the separators are flat separators in which a surface that faces the assembly is a flat surface, and
• the first gas diffusion member and second gas diffusion member are porous passage layers that are disposed between the flat separators and gas diffusion layers provided on the fuel electrode and the air electrode respectively.