Abstract: A lubricant composition is provided, wherein a base oil of the lubricant is a single ester having a chemical structure of (chemical formula 15) where an integer n is any of 7, 8 or 9, wherein at least one antioxidant of hindered phenol-based antioxidants, including at least one (3,5-di-tert-butyl-4-hydroxyphenyl), and hindered amine based antioxidants is included, wherein a triglyceride represented by the structure of (chemical formula 16) where R1, R2 and R3 are unsaturated or saturated straight chain structures or branched structures formed of CxHyOz is included and wherein the viscosity characteristics are no greater than 48 mPa·s at 40° C.