An organic light emitting device comprising: a first electrode; a second electrode that is provided opposite to the first electrode; and a light emitting layer that is provided between the first electrode and the second electrode, wherein the light emitting layer includes a first compound represented by the following Chemical Formula 1 and a second compound represented by the following Chemical Formula 2: in the Chemical Formula 1, X 1 to X 3 are each independently N or CH, provided that at least two of X 1 to X 3 is N, Ar 1 and Ar 2 are each independently deuterium; a substituted or unsubstituted C 6-60 aryl; or a substituted or unsubstituted C 2-60 heteroaryl containing any one or more heteroatoms selected from the group consisting of N, O and S, each Z is independently hydrogen or deuterium, or two adjacent groups of Zs combine with each other to form a C 6-60 aromatic ring or a C 2-60 heteroaromatic ring containing any one or more heteroatoms selected from the group consisting of N, O and S, wherein the C 6-60 aromatic ring and the C 2-60 heteroaromatic ring are unsubstituted or substituted with deuterium, n is an integer from 0 to 6, and A is a substituent represented by the following Chemical Formula 1-1, in the Chemical Formula 1-1, R 1 to R 4 are each independently hydrogen or deuterium, or two adjacent groups of R 1 to R 4 combine with each other to form a C 6-60 aromatic ring or a C 2-60 heteroaromatic ring containing any one or more heteroatoms selected from the group consisting of N, O and S, wherein the C 6-60 aromatic ring and the C 2-60 heteroaromatic ring are unsubstituted or substituted with deuterium, D means deuterium, and m is an integer from 0 to 6, in the Chemical Formula 2, T 1 to T 4 are each independently a substituted or unsubstituted C 6-60 aromatic ring; or a substituted or unsubstituted C 2-60 heteroaromatic ring containing any one or more heteroatoms 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 heteroatoms selected from the group consisting of N, O and S, and Ar 3 and Ar 4 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 heteroatoms selected from the group consisting of N, O and S. a first electrode; a second electrode that is provided opposite to the first electrode; and a light emitting layer that is provided between the first electrode and the second electrode, wherein the light emitting layer includes a first compound represented by the following Chemical Formula 1 and a second compound represented by the following Chemical Formula 2: in the Chemical Formula 1, X 1 to X 3 are each independently N or CH, provided that at least two of X 1 to X 3 is N, Ar 1 and Ar 2 are each independently deuterium; a substituted or unsubstituted C 6-60 aryl; or a substituted or unsubstituted C 2-60 heteroaryl containing any one or more heteroatoms selected from the group consisting of N, O and S, each Z is independently hydrogen or deuterium, or two adjacent groups of Zs combine with each other to form a C 6-60 aromatic ring or a C 2-60 heteroaromatic ring containing any one or more heteroatoms selected from the group consisting of N, O and S, wherein the C 6-60 aromatic ring and the C 2-60 heteroaromatic ring are unsubstituted or substituted with deuterium, n is an integer from 0 to 6, and A is a substituent represented by the following Chemical Formula 1-1, in the Chemical Formula 1-1, R 1 to R 4 are each independently hydrogen or deuterium, or two adjacent groups of R 1 to R 4 combine with each other to form a C 6-60 aromatic ring or a C 2-60 heteroaromatic ring containing any one or more heteroatoms selected from the group consisting of N, O and S, wherein the C 6-60 aromatic ring and the C 2-60 heteroaromatic ring are unsubstituted or substituted with deuterium, D means deuterium, and m is an integer from 0 to 6, in the Chemical Formula 2, T 1 to T 4 are each independently a substituted or unsubstituted C 6-60 aromatic ring; or a substituted or unsubstituted C 2-60 heteroaromatic ring containing any one or more heteroatoms 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 heteroatoms selected from the group consisting of N, O and S, and Ar 3 and Ar 4 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 heteroatoms selected from the group consisting of N, O and S.