NOVELTY - An aqueous paste contains electrode active material, conductive assistant comprising hydrophilic conductive carbonaceous material, and binder. W1 mass of dried carbonaceous material fine particles and ion exchange water are added to a separating funnel. Ion exchange water is further added and the fine particles adhered in the inner wall face of the funnel are poured in. The funnel is left still after shaking, and fine particles are extracted and dried to obtain W2 mass of fine particles. The hydrophilicity of the particles is determined from the mass of the particles.    USE - Aqueous paste for forming electrode of electrical storage device (claimed). Uses include but are not limited to lithium ion battery, lithium polymer battery, lithium primary battery, nickel-hydrogen battery and electrical double layer capacitor used as energy source for mobile machines and vehicles.    ADVANTAGE - The aqueous paste has excellent processability, reduced environmental impact and provides electrical storage device having high charging/discharging capacitance, high energy density, excellent cycle characteristics, high load characteristics, improved reliability and safety.    DETAILED DESCRIPTION - An aqueous paste contains electrode active material, conductive assistant comprising conductive carbonaceous material, and binder. The conductive carbonaceous material has hydrophilicity. The carbonaceous material fine particles (10 mg) dried at 120 degrees C for 24 hours is measured and W1 mass of the material and ion exchange water (300 g) are added from the upper opening of a 500 ml separating funnel. Ion exchange water (30 g) is further added and the fine particles adhered in the inner wall face of the funnel are poured in. The funnel is left still for 30 minutes after shaking for 1 minute. The cock of the funnel is opened and ion exchange water and the fine particles are extracted. The fine particles are filter-separated and dried at 120 degrees C for 24 hours to obtain W2 mass of the fine particles. The hydrophilicity of the fine particles is determined from the mass of the fine particles which satisfies the relation: (W2/W1)x 100 greater than or equal to 1.