The invention, together with base oil containing comb polymer, SSI (shear stability index) of the viscosity index improver is 30 or less include (A), HTHS viscosity (high-temperature high-shear _viscosity) at 0.99 ° C. _{(T 0.99} ) is 1.6~2.9mPa · s, and a kinematic viscosity _(V 40 at ^{40 ℃) [mm 2 / s} ] and HTHS viscosity _(T 0.99 at 150 ℃) [mPa · s] and the ratio of ( V ₄₀ / _{T 150)} is 12.4 or less, to provide a lubricating oil composition. The lubricating oil composition of the present invention, while a good variety properties such as viscosity at a high temperature region that assumes during high-speed operation of the engine, the better the fuel economy performance in a low-temperature region that assumes at the start of the engine.