A lubricating oil composition comprising, together with a base oil, a viscosity index improver comprising a comb-shaped polymer, a detergent dispersant comprising an alkali metal borate and an organometallic compound comprising a metal atom selected from an alkali metal atom and an alkaline earth metal atom, and a friction modifier comprising a molybdenum-containing friction modifier, with the total content of an alkali metal atom and an alkaline earth metal atom is 1,500 mass ppm or less on a basis of the total amount of the lubricating oil composition, wherein the organometallic compound is at least one selected from a metal salicylate, a metal phenate, and metal sulfonate, wherein a weight average molecular weight (Mw) of the comb-shaped polymer is 1,000 to 1,000,000, wherein the content of the comb-shaped polymer in the viscosity index improver is 60 to 100 mass% on a basis of the total amount of the solid component in the viscosity index improver, wherein, a content of the viscosity index improver is 0.1 to 20 mass% on a basis of the total amount of the lubricating oil composition, a content of the detergent dispersant is 0.01 to 20 mass% on a basis of the total amount of the lubricating oil composition, a content of the friction modifier is 0.01 to 3.0 mass% on a basis of the total amount of the lubricating oil composition, wherein the content of the comb-shaped polymer is 0.10 to 20 mass% on a basis of the total amount of the lubricating oil composition, and wherein a content of the alkali metal borate in terms of a boron atom is 0.01 to 0.10 mass% on a basis of the total amount of the lubricating oil composition. a viscosity index improver comprising a comb-shaped polymer, a detergent dispersant comprising an alkali metal borate and an organometallic compound comprising a metal atom selected from an alkali metal atom and an alkaline earth metal atom, and a friction modifier comprising a molybdenum-containing friction modifier, with the total content of an alkali metal atom and an alkaline earth metal atom is 1,500 mass ppm or less on a basis of the total amount of the lubricating oil composition, wherein the organometallic compound is at least one selected from a metal salicylate, a metal phenate, and metal sulfonate, wherein a weight average molecular weight (Mw) of the comb-shaped polymer is 1,000 to 1,000,000, wherein the content of the comb-shaped polymer in the viscosity index improver is 60 to 100 mass% on a basis of the total amount of the solid component in the viscosity index improver, wherein, a content of the viscosity index improver is 0.1 to 20 mass% on a basis of the total amount of the lubricating oil composition, a content of the detergent dispersant is 0.01 to 20 mass% on a basis of the total amount of the lubricating oil composition, a content of the friction modifier is 0.01 to 3.0 mass% on a basis of the total amount of the lubricating oil composition, wherein the content of the comb-shaped polymer is 0.10 to 20 mass% on a basis of the total amount of the lubricating oil composition, and wherein a content of the alkali metal borate in terms of a boron atom is 0.01 to 0.10 mass% on a basis of the total amount of the lubricating oil composition.