An electrode material for a nonaqueous solvent secondary cell, characterized in that the electrode material is a composite carbonaceous substance in which carbides of an organic substance containing not more than 12 parts by weight and not less than 0.1 parts by weight of residual carbon after heat treatment based on 100 parts by weight of a graphite carbonaceous substance is deposited on the surface of the graphite carbonaceous substance; and a method of manufacturing an electrode material for a nonaqueous solvent secondary cell, characterized in that the method has the steps of introducing a slurry prepared by adding an aromatic organic solvent to a mixture of particles of graphite carbonaceous substance and an organic material and adjusted in viscosity to not higher than 10,000 cp, into an agitator provided with a reaction chamber in which a paddle rotated by a shaft is installed, the inner surface of which reaction chamber is formed substantially along the outermost locus of rotation of the paddle, and a solvent deaeration mechanism, heating the mixture to a temperature above the boiling point of the solvent and below 600 DEG C while agitating the same, so as to produce a solid intermediate material, and heating the intermediate material above 600 DEG C in an inert gas atmosphere so as to carbonize the same. Using the electrode material a nonaqueous solvent secondary cell having such excellent electric characteristics that the irreversible capacity is suppressed to a very low level while maintaining as high a discharge capacity as that of graphite, and a high charging efficiency is high, and an improved stability with respect to an electrolyte is produced. By the manufacturing method, such a composite carbonaceous material of a high uniform performance can be produced stably and efficiently.