An organic light emitting device comprising: a first electrode; a second electrode provided to face the first electrode; and one or two 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 compound represented by the following Chemical Formula 1: [Chemical Formula 1] (HAr) a -[L1-Ar1-L2-(CN) b ] c in Chemical Formula 1, a to c are each an integer of 1 to 3, when a to c are each 2 or more, two or more structures in the parenthesis are the same as or different from each other, L1 and L2 are the same as or different from each other, and are each independently a substituted or unsubstituted divalent to tetravalent aromatic ring group, Ar1 is a substituted or unsubstituted arylene group, HAr is represented by the following Chemical Formula A or B: in Chemical Formulae A and B, X1 to X3 are the same as or different from each other, and are each independently N, CH or CD, at least two of X1 to X3 is N, Ar2, Ar3, and R1 are the same as or different from each other, and are each independently hydrogen; or a substituted or unsubstituted aryl group, or combine with an adjacent group to form a substituted or unsubstituted ring, n is an integer of 1 to 7, when n is 2 or more, two or more R1's are the same as or different from each other, and --- is a moiety linked to L1. a first electrode; a second electrode provided to face the first electrode; and one or two 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 compound represented by the following Chemical Formula 1: [Chemical Formula 1] (HAr) a -[L1-Ar1-L2-(CN) b ] c in Chemical Formula 1, a to c are each an integer of 1 to 3, when a to c are each 2 or more, two or more structures in the parenthesis are the same as or different from each other, L1 and L2 are the same as or different from each other, and are each independently a substituted or unsubstituted divalent to tetravalent aromatic ring group, Ar1 is a substituted or unsubstituted arylene group, HAr is represented by the following Chemical Formula A or B: in Chemical Formulae A and B, X1 to X3 are the same as or different from each other, and are each independently N, CH or CD, at least two of X1 to X3 is N, Ar2, Ar3, and R1 are the same as or different from each other, and are each independently hydrogen; or a substituted or unsubstituted aryl group, or combine with an adjacent group to form a substituted or unsubstituted ring, n is an integer of 1 to 7, when n is 2 or more, two or more R1's are the same as or different from each other, and --- is a moiety linked to L1. a to c are each an integer of 1 to 3, when a to c are each 2 or more, two or more structures in the parenthesis are the same as or different from each other, L1 and L2 are the same as or different from each other, and are each independently a substituted or unsubstituted divalent to tetravalent aromatic ring group, Ar1 is a substituted or unsubstituted arylene group, HAr is represented by the following Chemical Formula A or B: X1 to X3 are the same as or different from each other, and are each independently N, CH or CD, at least two of X1 to X3 is N, Ar2, Ar3, and R1 are the same as or different from each other, and are each independently hydrogen; or a substituted or unsubstituted aryl group, or combine with an adjacent group to form a substituted or unsubstituted ring, n is an integer of 1 to 7, when n is 2 or more, two or more R1's are the same as or different from each other, and --- is a moiety linked to L1. <EOS>