A lubricating oil composition comprising: a lubricating base oil including, as a main component, a lubricating base oil component having a saturated component content of 95% by mass or greater, a proportion of cyclic saturated component of 60% by mass or less in the saturated component, a viscosity index of 120 or greater, and an ε-methylene content in total constituent carbons at a proportion of 15 to 20%, wherein the lubricating base oil component is a mineral oil obtained by hydrocracking/hydroisomerisation of raw oil containing normal paraffin, wherein the proportion of the ε-methylene content contained in total carbon constituting the lubricating base oil component means the proportion of the total integrated intensity attributed to the CH 2 main chain to the total integrated intensity of total carbon measured by 13 C-NMR, wherein the measurement is made at room temperature and at a resonant frequency of 100 MHz using a gated decoupling method, wherein the lubricating base oil may include other lubricating base oil components, wherein the proportion of the other lubricating base oil components, based on the total mass of the lubricating base oil, is 40% by mass or less; and a poly(meth)acrylate based viscosity index improver having a weight average molecular weight of 50,000 or greater and a ratio of the weight average molecular weight to PSSI of 1 x 10 4 or greater, in an amount of 0.1 to 50% by mass based on a total mass of the lubricating oil composition, the lubricating oil composition having a kinematic viscosity of 3.0 to 12.0 mm 2 /s at 100°C and a ratio of HTHS viscosity at 150°C to HTHS viscosity at 100°C of 0.50 or greater, wherein the PSSI is the permanent shear stability index that complies with ASTM D 6022-01 which is calculated in accordance with ASTM D 6278-2, and wherein the HTHS viscosity is the high-temperature high-shear viscosity as measured in accordance with ASTM D 4683. a lubricating base oil including, as a main component, a lubricating base oil component having a saturated component content of 95% by mass or greater, a proportion of cyclic saturated component of 60% by mass or less in the saturated component, a viscosity index of 120 or greater, and an ε-methylene content in total constituent carbons at a proportion of 15 to 20%, wherein the lubricating base oil component is a mineral oil obtained by hydrocracking/hydroisomerisation of raw oil containing normal paraffin, wherein the proportion of the ε-methylene content contained in total carbon constituting the lubricating base oil component means the proportion of the total integrated intensity attributed to the CH 2 main chain to the total integrated intensity of total carbon measured by 13 C-NMR, wherein the measurement is made at room temperature and at a resonant frequency of 100 MHz using a gated decoupling method, wherein the lubricating base oil may include other lubricating base oil components, wherein the proportion of the other lubricating base oil components, based on the total mass of the lubricating base oil, is 40% by mass or less; and a poly(meth)acrylate based viscosity index improver having a weight average molecular weight of 50,000 or greater and a ratio of the weight average molecular weight to PSSI of 1 x 10 4 or greater, in an amount of 0.1 to 50% by mass based on a total mass of the lubricating oil composition, the lubricating oil composition having a kinematic viscosity of 3.0 to 12.0 mm 2 /s at 100°C and a ratio of HTHS viscosity at 150°C to HTHS viscosity at 100°C of 0.50 or greater, wherein the PSSI is the permanent shear stability index that complies with ASTM D 6022-01 which is calculated in accordance with ASTM D 6278-2, and wherein the HTHS viscosity is the high-temperature high-shear viscosity as measured in accordance with ASTM D 4683.