A lubricating oil composition comprising: a base oil having a kinematic viscosity at 40 degrees C in a range from 10 mm 2 /s to 1000 mm 2 /s; at least one of phosphorus compounds represented by a formula below in an amount of 0.001 mass% to 0.3 mass% in terms of a phosphorus content, wherein: R is a hydrogen atom or an alkyl group having 3 or less carbon atoms; and X is an oxygen atom or a sulfur atom; at least one of a sulfur compound (B-1) which is a dithiophosphate compound selected from the group consisting of dihexyl dithiophosphate, dioctyl dithiophosphate, di(2-ethylhexyl) dithiophosphate, didodecyl dithiophosphate, dihexadecyl dithiophosphate, di(hexylthioethyl) dithiophosphate, di(octylthioethyl) dithiophosphate, di(dodecylthioethyl) dithiophosphate, di(hexadecylthioethyl) dithiophosphate, dioctanyl dithiophosphate, dioleyl dithiophosphate, dicyclohexyl dithiophosphate, diphenyl dithiophosphate, ditolyl dithiophosphate, dibenzyl dithiophosphate, diphenethyl dithiophosphate and ethyl-3-[{bis(1-methylethoxy)phosphinothioyl}thio]propionate; and a sulfur compound (B-2) comprising a dithio (-S-S-) bond in a molecule in an amount of 0.01 mass% to 0.5 mass% in terms of a sulfur content, the sulfur compound (B-2), when added to the base oil in an amount of 1 mass%, leading to a rating of 2 or lower in a copper strip corrosion test according to JIS K 2513, measurement conditions: at 100 degrees C for three hours, a carboxylic acid amide with an acid number, measured according to JIS K 2501, of 10 mg KOH/g or less in an amount of 0.01 mass% to 0.5 mass%, and a succinimide derivative which comprises an alkyl group or an alkenyl group in a side chain, the side chain having a number average molecular weight in a range from 500 to 3000 in an amount of 0.01 mass% to 1 mass%. a base oil having a kinematic viscosity at 40 degrees C in a range from 10 mm 2 /s to 1000 mm 2 /s; at least one of phosphorus compounds represented by a formula below in an amount of 0.001 mass% to 0.3 mass% in terms of a phosphorus content, wherein: R is a hydrogen atom or an alkyl group having 3 or less carbon atoms; and X is an oxygen atom or a sulfur atom; at least one of a sulfur compound (B-1) at least one of phosphorus compounds represented by a formula below in an amount of 0.001 mass% to 0.3 mass% in terms of a phosphorus content, wherein: R is a hydrogen atom or an alkyl group having 3 or less carbon atoms; and X is an oxygen atom or a sulfur atom; at least one of a sulfur compound (B-1) which is a dithiophosphate compound selected from the group consisting of dihexyl dithiophosphate, dioctyl dithiophosphate, di(2-ethylhexyl) dithiophosphate, didodecyl dithiophosphate, dihexadecyl dithiophosphate, di(hexylthioethyl) dithiophosphate, di(octylthioethyl) dithiophosphate, di(dodecylthioethyl) dithiophosphate, di(hexadecylthioethyl) dithiophosphate, dioctanyl dithiophosphate, dioleyl dithiophosphate, dicyclohexyl dithiophosphate, diphenyl dithiophosphate, ditolyl dithiophosphate, dibenzyl dithiophosphate, diphenethyl dithiophosphate and ethyl-3-[{bis(1-methylethoxy)phosphinothioyl}thio]propionate; and a sulfur compound (B-2) comprising a dithio (-S-S-) bond in a molecule in an amount of 0.01 mass% to 0.5 mass% in terms of a sulfur content, the sulfur compound (B-2), when added to the base oil in an amount of 1 mass%, leading to a rating of 2 or lower in a copper strip corrosion test according to JIS K 2513, measurement conditions: at 100 degrees C for three hours, a carboxylic acid amide with an acid number, measured according to JIS K 2501, of 10 mg KOH/g or less in an amount of 0.01 mass% to 0.5 mass%, and a succinimide derivative which comprises an alkyl group or an alkenyl group in a side chain, the side chain having a number average molecular weight in a range from 500 to 3000 in an amount of 0.01 mass% to 1 mass%. a carboxylic acid amide with an acid number, measured according to JIS K 2501, of 10 mg KOH/g or less in an amount of 0.01 mass% to 0.5 mass%, and a succinimide derivative which comprises an alkyl group or an alkenyl group in a side chain, the side chain having a number average molecular weight in a range from 500 to 3000 in an amount of 0.01 mass% to 1 mass%.