A lubricating oil composition comprising, together with a base oil, a viscosity index improver (A) comprising a comb-shaped polymer (A1), a detergent dispersant (B) comprising an alkali metal borate (B1) and an organometallic compound (B2) comprising a metal atom selected from an alkali metal atom and an alkaline earth metal atom, and a friction modifier (C) 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 (B2) 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 (A1) is 1,000 to 1,000,000, wherein the content of the comb-shaped polymer (A1) in the viscosity index improver (A) is 60 to 100 mass% on a basis of the total amount of the solid component in the viscosity index improver (A), wherein, a content of the viscosity index improver (A) is 0.1 to 20 mass% on a basis of the total amount of the lubricating oil composition, a content of the detergent dispersant (B) is 0.01 to 20 mass% on a basis of the total amount of the lubricating oil composition, a content of the friction modifier (C) 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 (A1) 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 (B1) 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 (A) comprising a comb-shaped polymer (A1), a detergent dispersant (B) comprising an alkali metal borate (B1) and an organometallic compound (B2) comprising a metal atom selected from an alkali metal atom and an alkaline earth metal atom, and a friction modifier (C) 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 (B2) 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 (A1) is 1,000 to 1,000,000, wherein the content of the comb-shaped polymer (A1) in the viscosity index improver (A) is 60 to 100 mass% on a basis of the total amount of the solid component in the viscosity index improver (A), wherein, a content of the viscosity index improver (A) is 0.1 to 20 mass% on a basis of the total amount of the lubricating oil composition, a content of the detergent dispersant (B) is 0.01 to 20 mass% on a basis of the total amount of the lubricating oil composition, a content of the friction modifier (C) 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 (A1) 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 (B1) 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. <EOS>