The problem of the present invention is to provide an electrode body in which electron conductivity of a coated active material improves and reaction resistance decreases. The present invention solves the above-mentioned problem by providing an electrode body comprising a coated active material having an oxide active material and a coat layer for coating the surface of the above-mentioned oxide active material, containing an oxide solid electrolyte material, and a sulfide solid electrolyte material contacting with the above-mentioned coated active material, characterized in that the above-mentioned coat layer contains a conductive assistant.