A method of producing an electrode material for an electric storage device comprising oxidized conductive carbon and an electrode active material particle, comprising: a carbon-oxidizing step of obtaining the oxidized conductive carbon by giving an oxidizing treatment to a carbon raw material; a carbon-selecting step of obtaining a contained amount of a hydrophilic part in the oxidized conductive carbon by the process of adding 0.1 g of the oxidized conductive carbon to 20 ml of an ammonia aqueous solution with pH 11, applying ultrasonic irradiation for 1 minute, leaving a fluid obtained for 5 hours to precipitate its solid phase part, removing a supernatant fluid having the hydrophilic part, drying a remaining part, measuring the weight of a solid object after drying, obtaining the weight of the hydrophilic part by subtracting the weight of the solid object after drying from the initial weight 0.1g of the oxidized conductive carbon, and calculating the ratio of the weight of the hydrophilic part against the initial weight 0.1g of the oxidized conductive carbon, and then selecting the oxidized conductive carbon having the hydrophilic part in the amount of 10 % mass or more of the entire conductive carbon; and a combining step of mixing the oxidized conductive carbon selected with the electrode active material particle so that at least part of the oxidized carbon selected is deformed into a paste-like state in which the grain boundary of carbon primary particles is not observed and non-particulate amorphous carbons are connected with each other in an SEM image at a magnification of 25,000 by a pressure added to the oxidized carbon selected in the combining step, and the deformed oxidized carbon is attached to a surface of the electrode active material particle. a carbon-oxidizing step of obtaining the oxidized conductive carbon by giving an oxidizing treatment to a carbon raw material; a carbon-selecting step of obtaining a contained amount of a hydrophilic part in the oxidized conductive carbon by the process of adding 0.1 g of the oxidized conductive carbon to 20 ml of an ammonia aqueous solution with pH 11, applying ultrasonic irradiation for 1 minute, leaving a fluid obtained for 5 hours to precipitate its solid phase part, removing a supernatant fluid having the hydrophilic part, drying a remaining part, measuring the weight of a solid object after drying, obtaining the weight of the hydrophilic part by subtracting the weight of the solid object after drying from the initial weight 0.1g of the oxidized conductive carbon, and calculating the ratio of the weight of the hydrophilic part against the initial weight 0.1g of the oxidized conductive carbon, and then selecting the oxidized conductive carbon having the hydrophilic part in the amount of 10 % mass or more of the entire conductive carbon; and a combining step of mixing the oxidized conductive carbon selected with the electrode active material particle so that at least part of the oxidized carbon selected is deformed into a paste-like state in which the grain boundary of carbon primary particles is not observed and non-particulate amorphous carbons are connected with each other in an SEM image at a magnification of 25,000 by a pressure added to the oxidized carbon selected in the combining step, and the deformed oxidized carbon is attached to a surface of the electrode active material particle.