NOVELTY - A negative electrode active material contains carbon material formed using petroleum-based heavy oil and/or coal-based heavy oil, and has spacing between crystal planes (d002) of 0.34 nm or more, microcrystal size in C-axis direction of 10 nm or more, total porosity volume on the surface of 0.02 cc/g or more, pore volume of 10 nm or less of 0.01-0.1 cc/g, and pore area of 50 m2/g or more. The ratio of intensity of diffraction peak at wavelength of 1360 cm-1 to diffraction peak at wavelength of 1580 cm-1 of negative electrode active material is 0.8-1.2.    USE - Negative electrode active material is used for lithium secondary battery used as power supply of electronics devices such as mobile telephone, personal computer, personal digital assistant and hand-held video camera and for hybrid electric vehicles, power tool and electric power storage.    ADVANTAGE - The lithium secondary battery comprising negative electrode active material is excellent in charging and discharging characteristics.    DETAILED DESCRIPTION - A negative electrode active material contains carbon material formed using petroleum-based heavy oil and/or coal-based heavy oil as raw material. The negative electrode active material has spacing between crystal planes (d002) is 0.34 nm or more measured by X-ray diffraction, microcrystal size (Lc (110)) in C-axis direction of 10 nm or more, total porosity volume on the surface of 0.02 cc/g or more, pore volume of 10 nm or less of 0.01-0.1 cc/g, and pore area of 50 m2/g or more. The ratio of intensity of diffraction peak at wavelength of 1360 cm-1 to diffraction peak at wavelength of 1580 cm-1 of the negative electrode active material is 0.8-1.2 measured by Raman spectroscopy. An INDEPENDENT CLAIM is included for manufacture of negative electrode active material.    DESCRIPTION OF DRAWING(S) - The drawing shows schematic view of lithium secondary battery.    Positive electrode can (10)    Insulation packing (12)    Positive electrode collector (14)    Positive electrode (16)    Separator (18)