This gas diffusion layer base material for fuel cells is composed of (A) carbonaceous fibers, (B) graphite particles, and (C) a carbonaceous material that bonds the carbonaceous fibers and the graphite particles with each other, and satisfies the following requirements.(1) The carbon particles (B) have a particle diameter of 20 μm or less.(2) The mass content of the carbonaceous material (C) relative to the total mass of the carbonaceous fibers (A), the carbon particles (B) and the carbonaceous material (C) is 35% or more.(3) The number of bonded oxygen atoms in the surface of this gas diffusion layer base material for fuel cells is 1% or more of the total number of carbon atoms in the surface of this gas diffusion layer base material for fuel cells.
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