An organic electroluminescent device comprising at least one light-emitting layer between an anode and a cathode, wherein the light-emitting layer comprises a host and a phosphorescent dopant; the host comprises plural host compounds; at least a first host compound of the plural host compounds is represented by the following formula 1; and a second host compound is represented by the following formula 2. wherein Z represents NR 4; X 1 to X 4 each independently represent N or C(R 7), one or more of X 1 to X 4 is N; Y 1 to Y 3 each independently represent N or C(R 8), two or more of Y 1 to Y 3 is N; R 1 to R 4, R 7 and R 8 each independently represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted 3- to 30-membered heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, a substituted or unsubstituted mono- or di- (C1-C30)alkylamino, a substituted or unsubstituted mono- or di- (C6-C30)arylamino, or a substituted or unsubstituted (C1-C30)alkyl(C6-C30)arylamino; or may be linked to an adjacent substituent to form a substituted or unsubstituted mono- or polycyclic, (C3-C30) alicyclic or aromatic ring, whose carbon atom(s) may be replaced with at least one heteroatom selected from nitrogen, oxygen, and sulfur; a and b each independently represent an integer of 1 to 4; c represents 1 or 2; where a, b, or c is an integer of 2 or more, each of R 1, each of R 2, or each of R 3 may be the same or different; and the heteroaryl contains at least one heteroatom selected from B, N, O, S, Si, and P. wherein A 1 and A 2 each independently represent a (C6-C30)aryl unsubstituted or substituted with deuterium, a (C1-C30)alkyl, a (C6-C30)aryl or a tri(C6-C30)arylsilyl group; L 1 represents a substituted or unsubstituted (C6-C30)arylene; and X 1 to X 16 each independently represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C2-C30)alkenyl, a substituted or unsubstituted (C2-C30)alkynyl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C60)aryl, a substituted or unsubstituted 3- to 30-membered heteroaryl, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, or a substituted or unsubstituted mono- or di- (C6-C30)arylamino; or adjacent substituents may be linked to each other to form a substituted or unsubstituted mono- or polycyclic, (C3-C30) alicyclic or aromatic ring, whose carbon atom(s) may be replaced with at least one heteroatom selected from nitrogen, oxygen, and sulfur. Z represents NR 4; X 1 to X 4 each independently represent N or C(R 7), one or more of X 1 to X 4 is N; Y 1 to Y 3 each independently represent N or C(R 8), two or more of Y 1 to Y 3 is N; R 1 to R 4, R 7 and R 8 each independently represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted 3- to 30-membered heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C1-C30)alkoxy, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, a substituted or unsubstituted (C1-C30)alkyldi(C6-C30)arylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, a substituted or unsubstituted mono- or di- (C1-C30)alkylamino, a substituted or unsubstituted mono- or di- (C6-C30)arylamino, or a substituted or unsubstituted (C1-C30)alkyl(C6-C30)arylamino; or may be linked to an adjacent substituent to form a substituted or unsubstituted mono- or polycyclic, (C3-C30) alicyclic or aromatic ring, whose carbon atom(s) may be replaced with at least one heteroatom selected from nitrogen, oxygen, and sulfur; a and b each independently represent an integer of 1 to 4; c represents 1 or 2; where a, b, or c is an integer of 2 or more, each of R 1, each of R 2, or each of R 3 may be the same or different; and the heteroaryl contains at least one heteroatom selected from B, N, O, S, Si, and P. wherein A 1 and A 2 each independently represent a (C6-C30)aryl unsubstituted or substituted with deuterium, a (C1-C30)alkyl, a (C6-C30)aryl or a tri(C6-C30)arylsilyl group; L 1 represents a substituted or unsubstituted (C6-C30)arylene; and X 1 to X 16 each independently represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C2-C30)alkenyl, a substituted or unsubstituted (C2-C30)alkynyl, a substituted or unsubstituted (C3-C30)cycloalkyl, a substituted or unsubstituted (C6-C60)aryl, a substituted or unsubstituted 3- to 30-membered heteroaryl, a substituted or unsubstituted tri(C1-C30)alkylsilyl, a substituted or unsubstituted tri(C6-C30)arylsilyl, a substituted or unsubstituted di(C1-C30)alkyl(C6-C30)arylsilyl, or a substituted or unsubstituted mono- or di- (C6-C30)arylamino; or adjacent substituents may be linked to each other to form a substituted or unsubstituted mono- or polycyclic, (C3-C30) alicyclic or aromatic ring, whose carbon atom(s) may be replaced with at least one heteroatom selected from nitrogen, oxygen, and sulfur.