The present invention provides a porous electrode substrate that has low production cost, high mechanical strength, thickness precision, and surface smoothness, and sufficient gas permeability and electrical conductivity, and a method for producing the sam...

A porous electrically conductive sheet, which (a) comprises a sheet composed of numerous carbon fibers being attached with an organic material, (b) has an electric resistance of 50 mΩ · cm or less in the thickness direction of the sheet, (c) has a maximu...