An electrode 30 (such as a positive electrode for a lithium ion battery) is provided in which an active material layer (35), having an electrode active material as a main component thereof, is held by a metallic power collector (32). A barrier layer (33) containing a non-water-soluble polymeric material (334) and a conductive material (332) is provided on the surface of the power collector (32). An interconnecting layer (34), having higher electrical conductivity than the barrier layer (33) and containing a polymeric material (344) and a conductive material (342), is interposed between the barrier layer (33) and the active material layer (35).