A method for manufacturing a carbonaceous material for a negative electrode of non-aqueous electrolyte secondary batteries comprising the following steps: heating plant-derived char having an average particle diameter of 100 to 10000 μm at 700°C to 1250°C under an inert gas atmosphere containing a hydrogen chloride so as to demineralize the plant-derived char in a gas-phase, mixing 35 weight % or more of the plant-derived char demineralized in a gas-phase, and an organic compound having a volatile-element of 10 weight % or more in an ignition treatment at 800°C, to obtain a mixture comprising them, wherein a pulverization of the plant-derived char demineralized in a gas-phase is performed before, after, or with the mixing step, the organic compound being a non-graphitizable carbon precursor selected from the group consisting of infusible pitch or tar, thermosetting resins, infusible thermoplastic resins, and plant-derived organic substances; or a graphitizable carbon precursor selected from the group consisting of pitch and polymeric compounds; or a mixture of a non-graphitizable carbon precursor and graphitizable carbon precursor; or a volatile organic compound which has an actual carbon ratio of less than 5 weight % in an ignition treatment at 800°C, is solid at ordinary temperature, and is selected from the group consisting of polystyrene, polyethylene, polypropylene, poly(meth)acrylic acid, poly(meth)acrylic acid ester, naphthalene, phenanthrene, anthracene, and pyrene, and subjecting the mixture to final heat-treatment at 800 to 1600°C under a non-oxidizing gas atmosphere, or pre-heat-treatment at no less than 350°C to less than 800°C, and final heat-treatment at 800 to 1600°C under a non-oxidizing gas atmosphere, so as to obtain the carbonaceous material having a specific surface area determined by a BET method of 10 m 2 /g or less. heating plant-derived char having an average particle diameter of 100 to 10000 μm at 700°C to 1250°C under an inert gas atmosphere containing a hydrogen chloride so as to demineralize the plant-derived char in a gas-phase, mixing 35 weight % or more of the plant-derived char demineralized in a gas-phase, and an organic compound having a volatile-element of 10 weight % or more in an ignition treatment at 800°C, to obtain a mixture comprising them, wherein a pulverization of the plant-derived char demineralized in a gas-phase is performed before, after, or with the mixing step, the organic compound being a non-graphitizable carbon precursor selected from the group consisting of infusible pitch or tar, thermosetting resins, infusible thermoplastic resins, and plant-derived organic substances; or a graphitizable carbon precursor selected from the group consisting of pitch and polymeric compounds; or a mixture of a non-graphitizable carbon precursor and graphitizable carbon precursor; or a volatile organic compound which has an actual carbon ratio of less than 5 weight % in an ignition treatment at 800°C, is solid at ordinary temperature, and is selected from the group consisting of polystyrene, polyethylene, polypropylene, poly(meth)acrylic acid, poly(meth)acrylic acid ester, naphthalene, phenanthrene, anthracene, and pyrene, and subjecting the mixture to final heat-treatment at 800 to 1600°C under a non-oxidizing gas atmosphere, or pre-heat-treatment at no less than 350°C to less than 800°C, and final heat-treatment at 800 to 1600°C under a non-oxidizing gas atmosphere, so as to obtain the carbonaceous material having a specific surface area determined by a BET method of 10 m 2 /g or less.