The present invention provides a method of producing composite particle for high density electrochemical element electrodes in electrochemical elements having low internal resistance and high capacitance.Slurry containing an electric conductive material and a binder is obtained, and the slurry is sprayed to a fluidized electrode active material to carry out fluidized-granulation, and further particles obtained by the fluidized-granulation are rolling-fluidized granulated, and thereby, composite particle for electrochemical element electrode, containing electrode active materials, electric conductive materials, and binders, and being structured of an outer layer portion (outer shell portion) and an inner layer portion (core portion), where the outer shell portion and the core portion are made by bonding the electrode active material and the electric conductive material by the binder, and the weight average particle diameter of the electrode active material and the electric conductive material which form the outer shell portion is smaller than the weight average particle diameter of the electrode active material and the electric conductive material which form the core portion are obtained.