The present invention provides a binder for an electrode of a non-aqueous electrolyte secondary battery comprising a copolymer, wherein the copolymer contains 0.0005˜0.05 moles of group of an acid having nitrogen family element or chalcogen element or 0.0005˜0.05 moles of group of salts of the acid per 100 g of the copolymer. The binder exhibits excellent dispersion of an active material for an electrode. The invention also provides an electrode for a non-aqueous electrolyte secondary battery, in which the active material layer formed by the composition for an electrode containing the above binder and the active material for an electrode is adhered to the current collector, in which the active material for an electrode is densely-filled, and which exhibits excellent surface smoothness.