Disclosed are benzofluorene compounds of formula (1) exhibiting excellent performance when applied to an organic electroluminescent device, wherein Ar1 and Ar2 are aryl which may be substituted; R1 and R2 each are independently hydrogen, alkyl which may be substituted, cycloalkyl which may be substituted or aryl which may be substituted, and at least one of R1 and R2 is aryl which may be substituted; and the substituents in Ar1, Ar2, R1 and R2 each are independently selected from the group consisting of alkyl having 1 to 24 carbon atoms, cycloalkyl having 3 to 12 carbon atoms and aryl having 6 to 30 carbon atoms.