An organic light emitting device comprising: a first electrode; a second electrode; and one or more organic material layers provided between the first electrode and the second electrode, wherein one or more layers of the organic material layers comprise a heterocyclic compound represented by the following Chemical Formula 1 and a heterocyclic compound represented by the following Chemical Formula 2 at the same time: in Chemical Formulae 1 and 2, N-Het is a monocyclic or multicyclic heterocyclic group substituted or unsubstituted, and comprising one or more Ns; L is a direct bond; a substituted or unsubstituted arylene group; or a substituted or unsubstituted heteroarylene group, a is an integer of 1 to 3, and when a is 2 or greater, Ls are the same as or different from each other; R a and R b are the same as or different from each other, and each independently a substituted or unsubstituted aryl group; or a substituted or unsubstituted heteroaryl group; and R1 to R10, R c and R d are the same as or different from each other, and each independently selected from the group consisting of hydrogen; deuterium; halogen; a cyano group; a substituted or unsubstituted alkyl group; a substituted or unsubstituted alkenyl group; a substituted or unsubstituted alkynyl group; a substituted or unsubstituted alkoxy group; a substituted or unsubstituted cycloalkyl group; a substituted or unsubstituted heterocycloalkyl group; a substituted or unsubstituted aryl group; a substituted or unsubstituted heteroaryl group; a substituted or unsubstituted silyl group; a substituted or unsubstituted phosphine oxide group; and a substituted or unsubstituted amine group, or two or more groups adjacent to each other bond to each other to form a substituted or unsubstituted aliphatic or aromatic hydrocarbon ring or heteroring, b and c are each an integer of 1 to 3, and when b is 2 or greater, R9s are the same as or different from each other and when c is 2 or greater, R10s are the same as or different from each other, r and s are each an integer of 0 to 7, and when r is 2 or greater, R c s are the same as or different from each other and when s is 2 or greater, R d s are the same as or different from each other. a first electrode; a second electrode; and one or more organic material layers provided between the first electrode and the second electrode, N-Het is a monocyclic or multicyclic heterocyclic group substituted or unsubstituted, and comprising one or more Ns; L is a direct bond; a substituted or unsubstituted arylene group; or a substituted or unsubstituted heteroarylene group, a is an integer of 1 to 3, and when a is 2 or greater, Ls are the same as or different from each other; R a and R b are the same as or different from each other, and each independently a substituted or unsubstituted aryl group; or a substituted or unsubstituted heteroaryl group; and R1 to R10, R c and R d are the same as or different from each other, and each independently selected from the group consisting of hydrogen; deuterium; halogen; a cyano group; a substituted or unsubstituted alkyl group; a substituted or unsubstituted alkenyl group; a substituted or unsubstituted alkynyl group; a substituted or unsubstituted alkoxy group; a substituted or unsubstituted cycloalkyl group; a substituted or unsubstituted heterocycloalkyl group; a substituted or unsubstituted aryl group; a substituted or unsubstituted heteroaryl group; a substituted or unsubstituted silyl group; a substituted or unsubstituted phosphine oxide group; and a substituted or unsubstituted amine group, or two or more groups adjacent to each other bond to each other to form a substituted or unsubstituted aliphatic or aromatic hydrocarbon ring or heteroring, b and c are each an integer of 1 to 3, and when b is 2 or greater, R9s are the same as or different from each other and when c is 2 or greater, R10s are the same as or different from each other, r and s are each an integer of 0 to 7, and when r is 2 or greater, R c s are the same as or different from each other and when s is 2 or greater, R d s are the same as or different from each other.