Electrode base material for fuel cell

Disclosed are a carbon porous membranous structure having fine interconnecting pores an average diameter of which is 0.05 to 10 µm and a porosity of 15 to 85% and a metal-dispersed carbon structure comprising that carbon porous membranous structure having dispersed therein fine particles of at least one kind of a metal and an alloy. The carbon porous membranous structures are useful as a component of fuel cells, particularly as an electrode base material of gas diffusion electrodes for solid polymer electrolyte fuel cells and phosphoric acid fuel cells.