A lubricating oil composition comprising an amide compound represented by the following general formula: wherein R 1 and R 2 each independently represent a hydrocarbon group having 6 or more carbon atoms, R 3 represents a hydroxyalkyl group having 1 or more and 6 or less carbon atoms, or a group formed through condensation of the hydroxyalkyl group and an acylating agent, and X represents an oxygen atom or a sulfur atom, wherein the content of the hydrocarbon group having 12 carbon atoms as R 1 and R 2 in all R 1 's and R 2 's contained in the amide compound is 30% by mass or more and 75% by mass or less, and the content of the hydrocarbon group having 14 carbon atoms therein is 5% by mass or more and 40% by mass or less, wherein the content of the amide compound is 0.1% by mass or more and 2% by mass or less based on the total amount of the composition, a metal-based detergent which is at least one selected from an alkaline earth metal sulfonate, an alkaline earth metal phenate and an alkaline earth metal salicylate, wherein the content of the metal-based detergent is 0.05% by mass or more and 2% by mass or less based on the total amount of the composition, at least one phosphorus acid ester selected from an acid phosphate ester represented by the general formula and an acid phosphite ester represented by the general formula: in the general formulae and, R 4 and R 7 each represent an alkyl group, an alkenyl group, a cycloalkyl group, an aryl group or an arylalkyl group, wherein the number of carbons in the alkyl group and the alkenyl group is 2 or more and 14 or less, the number of carbons in the cycloalkyl group and the aryl group is 6 or more and 14 or less, and the number of carbons in the arylalkyl group is 7 or more and 14 or less, wherein the content of the phosphorus acid ester is 0.15% by mass or more and 2% by mass or less based on the total amount of the composition, and a base oil. an amide compound represented by the following general formula: wherein R 1 and R 2 each independently represent a hydrocarbon group having 6 or more carbon atoms, R 3 represents a hydroxyalkyl group having 1 or more and 6 or less carbon atoms, or a group formed through condensation of the hydroxyalkyl group and an acylating agent, and X represents an oxygen atom or a sulfur atom, wherein the content of the hydrocarbon group having 12 carbon atoms as R 1 and R 2 in all R 1 's and R 2 's contained in the amide compound is 30% by mass or more and 75% by mass or less, and the content of the hydrocarbon group having 14 carbon atoms therein is 5% by mass or more and 40% by mass or less, wherein the content of the amide compound is 0.1% by mass or more and 2% by mass or less based on the total amount of the composition, a metal-based detergent which is at least one selected from an alkaline earth metal sulfonate, an alkaline earth metal phenate and an alkaline earth metal salicylate, wherein the content of the metal-based detergent is 0.05% by mass or more and 2% by mass or less based on the total amount of the composition, at least one phosphorus acid ester selected from an acid phosphate ester represented by the general formula and an acid phosphite ester represented by the general formula: in the general formulae and, R 4 and R 7 each represent an alkyl group, an alkenyl group, a cycloalkyl group, an aryl group or an arylalkyl group, wherein the number of carbons in the alkyl group and the alkenyl group is 2 or more and 14 or less, the number of carbons in the cycloalkyl group and the aryl group is 6 or more and 14 or less, and the number of carbons in the arylalkyl group is 7 or more and 14 or less, wherein the content of the phosphorus acid ester is 0.15% by mass or more and 2% by mass or less based on the total amount of the composition, and a base oil.