An organic electroluminescent compound represented by the following formula 1: wherein Ar 1 represents a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted 5- to 30-membered heteroaryl; R 1 and R 2 each independently represent hydrogen, deuterium, a halogen, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (C3-C30)cycloalkyl; or are linked to an adjacent substituent(s) to form a substituted or unsubstituted, mono- or polycyclic, 3- to 30-membered alicyclic or aromatic ring, or a combination thereof; R 3 to R 7 each independently represent hydrogen, deuterium, a halogen, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted 5- to 30-membered heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C30)aryl(C1-C30)alkyl, -N(R 11)(R 12), - Si(R 13)(R 14)(R 15), -S(R 16), -O(R 17), a cyano, a nitro, or a hydroxyl; R 11 to R 17 each independently represent hydrogen, deuterium, a halogen, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted 5- to 30-membered heteroaryl, a substituted or unsubstituted 3- to 7-membered heterocycloalkyl, or a substituted or unsubstituted (C3-C30)cycloalkyl; or are linked to an adjacent substituent(s) to form a substituted or unsubstituted, mono- or polycyclic, 3- to 30-membered alicyclic or aromatic ring, or a combination thereof; and a and e each independently represent an integer of 1 to 4, b and c each independently represent an integer of 1 to 3, and d represents an integer of 1 or 2, in which if each of a to e is an integer of 2 or more, each of R 3 to R 7 may be the same or different. Ar 1 represents a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted 5- to 30-membered heteroaryl; R 1 and R 2 each independently represent hydrogen, deuterium, a halogen, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (C3-C30)cycloalkyl; or are linked to an adjacent substituent(s) to form a substituted or unsubstituted, mono- or polycyclic, 3- to 30-membered alicyclic or aromatic ring, or a combination thereof; R 3 to R 7 each independently represent hydrogen, deuterium, a halogen, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted 5- to 30-membered heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C30)aryl(C1-C30)alkyl, -N(R 11)(R 12), - Si(R 13)(R 14)(R 15), -S(R 16), -O(R 17), a cyano, a nitro, or a hydroxyl; R 11 to R 17 each independently represent hydrogen, deuterium, a halogen, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted 5- to 30-membered heteroaryl, a substituted or unsubstituted 3- to 7-membered heterocycloalkyl, or a substituted or unsubstituted (C3-C30)cycloalkyl; or are linked to an adjacent substituent(s) to form a substituted or unsubstituted, mono- or polycyclic, 3- to 30-membered alicyclic or aromatic ring, or a combination thereof; and a and e each independently represent an integer of 1 to 4, b and c each independently represent an integer of 1 to 3, and d represents an integer of 1 or 2, in which if each of a to e is an integer of 2 or more, each of R 3 to R 7 may be the same or different.