PURPOSE: To provide a secondary battery having a large capacity and a high energy density in which the manufacture of a positive electrode material is easy, compared with other positive electrode materials requiring pressure mold ing, because it can be manufactured with a simple method such as application.

CONSTITUTION: A conductive polymer composite consisting of (A) polyaniline and at least one selected from the group consisting of simple polymers, block copolymers, and random copolymers of (B) alkylene oxide monomer, and cross- linked bodies obtained by cross-linking them, and at least one selected from the group consisting of anions, alkali metal salts and alkaline earth metal salts of (C) protonic acid is used as a positive electrode active material.