A porous membrane provided on the surface of an electrode used in a secondary battery or the like, which helps to reduce materials adhering to a roll during winding of the electrode. The porous membrane is characterized by containing an inorganic filler and a binder which contains a styrene resin and a polymer having a glass transition temperature of not more than 15 DEG C. A secondary battery electrode wherein an electrode mixture layer composed of a slurry for porous membranes, which contains an inorganic filler, a styrene resin, a polymer having a glass transition temperature of not more than 15 DEG C and a solvent, a binder and an electrode active material is adhered to a collector, and the surface of the electrode mixture layer is provided with the porous membrane.