A lubricating oil composition comprising: a lubricant base oil; an alkaline earth metal detergent, wherein the amount of the alkaline earth metal is 10 ppm or more by mass and 1000 ppm or less by mass on the basis of the total amount of the lubricating oil composition; 0.005% or more by mass and 0.90% or less by mass of a triazole-based compound represented by the following general formula or, on the basis of the total amount of the lubricating oil composition: wherein R 1 is a hydrogen atom or a methyl group, and R 2 and R 3 are each independently a hydrogen atom or a linear or branched hydrocarbon having 1 to 18 carbons, wherein R 4 is a hydrogen atom or a methyl group, and R 5 and R 6 are each independently a hydrogen atom or a linear or branched hydrocarbon having 1 to 18 carbons; at least one sulfur-containing compound selected from the group consisting of a sulfur-containing heterocyclic ether compound and a sulfide compound, wherein the sulfur-containing heterocyclic ether compound is a sulfolan-based compound represented by the following general formula: wherein R 10 is an alkyl group having 1 to 20 carbons, wherein the sulfide compound is represented by the following general formula: R 27 -S-R 28 wherein R 27 and R 28 are each independently a substituted or unsubstituted hydrocarbon group having 2 to 20 carbons, and at least one of R 27 and R 28 has a hydroxy group and/or a carboxyl group as a substituent, and wherein the amount of sulfur is 300 ppm or more by mass and 2000 ppm or less by mass, on the basis of the total amount of the lubricating oil composition; and 0.010% or more by mass and 4.0% or less by mass of an ashless dispersant on the basis of the total amount of the lubricating oil composition. a lubricant base oil; an alkaline earth metal detergent, wherein the amount of the alkaline earth metal is 10 ppm or more by mass and 1000 ppm or less by mass on the basis of the total amount of the lubricating oil composition; 0.005% or more by mass and 0.90% or less by mass of a triazole-based compound represented by the following general formula or, on the basis of the total amount of the lubricating oil composition: wherein R 1 is a hydrogen atom or a methyl group, and R 2 and R 3 are each independently a hydrogen atom or a linear or branched hydrocarbon having 1 to 18 carbons, wherein R 4 is a hydrogen atom or a methyl group, and R 5 and R 6 are each independently a hydrogen atom or a linear or branched hydrocarbon having 1 to 18 carbons; at least one sulfur-containing compound selected from the group consisting of a sulfur-containing heterocyclic ether compound and a sulfide compound, wherein the sulfur-containing heterocyclic ether compound is a sulfolan-based compound represented by the following general formula: wherein R 10 is an alkyl group having 1 to 20 carbons, wherein the sulfide compound is represented by the following general formula: R 27 -S-R 28 wherein R 27 and R 28 are each independently a substituted or unsubstituted hydrocarbon group having 2 to 20 carbons, and at least one of R 27 and R 28 has a hydroxy group and/or a carboxyl group as a substituent, and wherein the amount of sulfur is 300 ppm or more by mass and 2000 ppm or less by mass, on the basis of the total amount of the lubricating oil composition; and wherein the sulfur-containing heterocyclic ether compound is a sulfolan-based compound represented by the following general formula: wherein R 10 is an alkyl group having 1 to 20 carbons, wherein the sulfide compound is represented by the following general formula: R 27 -S-R 28 wherein R 27 and R 28 are each independently a substituted or unsubstituted hydrocarbon group having 2 to 20 carbons, and at least one of R 27 and R 28 has a hydroxy group and/or a carboxyl group as a substituent, and wherein the amount of sulfur is 300 ppm or more by mass and 2000 ppm or less by mass, on the basis of the total amount of the lubricating oil composition; and 0.010% or more by mass and 4.0% or less by mass of an ashless dispersant on the basis of the total amount of the lubricating oil composition.