An organic light emitting device comprising: an anode; a cathode; and a light emitting layer interposed between the anode and the cathode, wherein the light emitting layer comprises (i) a compound represented by the following Chemical Formula 1, and (ii) a compound represented by the following Chemical Formula 2, or the following Chemical Formula 3: wherein in Chemical Formula 1, L is a single bond; or a substituted or unsubstituted C 6-60 arylene, X's are N; or CH, with the proviso that at least two or more of X are N, R is hydrogen, deuterium, a substituted or unsubstituted C 6-60 aryl; or a substituted or unsubstituted C 2-60 heteroaryl containing any one or more selected from the group consisting of N, O and S, Ar 1 and Ar 2 are each independently a substituted or unsubstituted C 6-60 aryl; or a substituted or unsubstituted C 2-60 heteroaryl containing any one or more selected from the group consisting of N, O and S, wherein in Chemical Formulas 2 and 3, R' is a substituent represented by the following Chemical Formula 4, or a substituted or unsubstituted C 6-60 aryl, when R' is a substituent represented by the following Chemical Formula 4, R' 1 to R' 6 are each independently hydrogen or deuterium, when R' is not a substituent represented by the following Chemical Formula 4, any one of R' 1 to R' 6 is a substituent represented by the following Chemical Formula 4, and the rest are each independently hydrogen or deuterium; wherein in Chemical Formula 4, L' is a single bond, a substituted or unsubstituted C 6-60 arylene, or a substituted or unsubstituted C 2-60 heteroarylene containing any one or more selected from the group consisting of N, O and S, L' 1 and L' 2 are each independently a single bond, a substituted or unsubstituted C 6-60 arylene; or a substituted or unsubstituted C 2-60 heteroarylene containing any one or more selected from the group consisting of N, O and S, and Ar' 1 and Ar' 2 are each independently a substituted or unsubstituted C 6-60 aryl, or a substituted or unsubstituted C 2-60 heteroaryl containing any one or more selected from the group consisting of N, O and S. an anode; a cathode; and a light emitting layer interposed between the anode and the cathode, wherein the light emitting layer comprises (i) a compound represented by the following Chemical Formula 1, and (ii) a compound represented by the following Chemical Formula 2, or the following Chemical Formula 3: wherein in Chemical Formula 1, L is a single bond; or a substituted or unsubstituted C 6-60 arylene, X's are N; or CH, with the proviso that at least two or more of X are N, R is hydrogen, deuterium, a substituted or unsubstituted C 6-60 aryl; or a substituted or unsubstituted C 2-60 heteroaryl containing any one or more selected from the group consisting of N, O and S, Ar 1 and Ar 2 are each independently a substituted or unsubstituted C 6-60 aryl; or a substituted or unsubstituted C 2-60 heteroaryl containing any one or more selected from the group consisting of N, O and S, wherein in Chemical Formulas 2 and 3, R' is a substituent represented by the following Chemical Formula 4, or a substituted or unsubstituted C 6-60 aryl, when R' is a substituent represented by the following Chemical Formula 4, R' 1 to R' 6 are each independently hydrogen or deuterium, when R' is not a substituent represented by the following Chemical Formula 4, any one of R' 1 to R' 6 is a substituent represented by the following Chemical Formula 4, and the rest are each independently hydrogen or deuterium; wherein in Chemical Formula 4, L' is a single bond, a substituted or unsubstituted C 6-60 arylene, or a substituted or unsubstituted C 2-60 heteroarylene containing any one or more selected from the group consisting of N, O and S, L' 1 and L' 2 are each independently a single bond, a substituted or unsubstituted C 6-60 arylene; or a substituted or unsubstituted C 2-60 heteroarylene containing any one or more selected from the group consisting of N, O and S, and Ar' 1 and Ar' 2 are each independently a substituted or unsubstituted C 6-60 aryl, or a substituted or unsubstituted C 2-60 heteroaryl containing any one or more selected from the group consisting of N, O and S.