The present invention provides an organic thin film light emitting device having high luminous efficiency and durable life realized by using a benzindolocarbazole derivative as represented by either general formula (1-1) or (1-2) given below:[Chemical compound 1]wherein R1 to R24 may be identical to or different from each other and are selected from the group consisting of a hydrogen atom, alkyl group, cycloalkyl group, heterocyclic group, amino group, alkenyl group, cycloalkenyl group, alkynyl group, alkoxy group, alkylthio group, aryl ether group, aryl thioether group, aryl group, heteroaryl group, halogen atom, carbonyl group, carboxyl group, oxycarbonyl group, carbamoyl group, silyl group, and —P(═O)R25R26; R25 and R26 represent either an aryl group or a heteroaryl group; R25 and R26 may be condensed to form a ring; L1 to L4 independently represent a single bond, a substituted or unsubstituted arylene group, or a substituted or unsubstituted heteroarylene group; and A1 to A4 independently represent an amino group, aryl group, heterocyclic group, or heteroaryl group.