A lubricating oil composition for an internal combustion engine. The lubricating oil composition includes: (A1) a lubricant base oil as a main component having a kinematic viscosity at 100 degree C. being 1 to 8 mm2/s, pour point being −15 degree C. or less, aniline point being 100 degree C. or more, paraffinic content in saturates being 40 mass % or more, monocyclic naphthenic content being 25 mass % or less, bicyclic to hexacyclic naphthenic content being 35 mass % or less, iodine number being 2 or less, and ratio of tertiary carbon to the total carbon atoms composing the (A1) being 6.3% or more. The total mass of the composition is: (B) 0.005 to 0.5 mass % of a metallic detergent as metal content; (C1) 0.005 to 0.2 mass % of a boron-containing succinimide ashless dispersant as boron content; and (D) 0.005 to 0.2 mass % of a metal salt of phosphorus-containing acid as phosphorus content.