An organic electroluminescent device, comprising one or more light-emitting layers between an anode and a cathode opposite to each other, wherein at least one of the light-emitting layers contains at least one kind of host material represented by the following general formula and at least one kind of thermally activated delayed fluorescent light-emitting material represented by the following general formula: wherein, R 1 s each independently represent hydrogen, an aliphatic hydrocarbon group having 1 to 8 carbon atoms, a substituted or unsubstituted aromatic hydrocarbon group having 6 to 18 carbon atoms, a substituted or unsubstituted aromatic heterocyclic group having 3 to 17 carbon atoms, or a linked aromatic group formed by linking 2 to 6 aromatic rings of aromatic groups each selected from the aromatic hydrocarbon group and the aromatic heterocyclic group, and may each be fused with a carbazole ring to form a fused ring, provided that none of R 1 s represents a carbazolyl group; wherein, 2 is represented by the formula, and in the formula, a ring A is an aromatic hydrocarbon ring represented by the formula, a ring B is a heterocycle represented by the formula, and the ring A and the ring B are each fused with an adjacent ring at arbitrary positions, and X is selected from N-Ar 2, an oxygen atom, and a sulfur atom; Ar 1 and Ar 2 each independently represent a substituted or unsubstituted aromatic hydrocarbon group having 6 to 18 carbon atoms, a substituted or unsubstituted aromatic heterocyclic group having 3 to 17 carbon atoms, or a linked aromatic group formed by linking 2 to 6 aromatic rings of aromatic groups each selected from the aromatic hydrocarbon group and the aromatic heterocyclic group; R 2 s each independently represent an aliphatic hydrocarbon group having 1 to 10 carbon atoms, a substituted or unsubstituted aromatic hydrocarbon group having 6 to 18 carbon atoms, or a substituted or unsubstituted aromatic heterocyclic group having 3 to 17 carbon atoms, and may each be fused with an adjacent ring to form a fused ring; and a represents an integer of from 1 to 3, c and d each independently represent an integer of from 0 to 4, and j represents an integer of from 0 to 2. R 1 s each independently represent hydrogen, an aliphatic hydrocarbon group having 1 to 8 carbon atoms, a substituted or unsubstituted aromatic hydrocarbon group having 6 to 18 carbon atoms, a substituted or unsubstituted aromatic heterocyclic group having 3 to 17 carbon atoms, or a linked aromatic group formed by linking 2 to 6 aromatic rings of aromatic groups each selected from the aromatic hydrocarbon group and the aromatic heterocyclic group, and may each be fused with a carbazole ring to form a fused ring, provided that none of R 1 s represents a carbazolyl group; wherein, 2 is represented by the formula, and in the formula, a ring A is an aromatic hydrocarbon ring represented by the formula, a ring B is a heterocycle represented by the formula, and the ring A and the ring B are each fused with an adjacent ring at arbitrary positions, and X is selected from N-Ar 2, an oxygen atom, and a sulfur atom; Ar 1 and Ar 2 each independently represent a substituted or unsubstituted aromatic hydrocarbon group having 6 to 18 carbon atoms, a substituted or unsubstituted aromatic heterocyclic group having 3 to 17 carbon atoms, or a linked aromatic group formed by linking 2 to 6 aromatic rings of aromatic groups each selected from the aromatic hydrocarbon group and the aromatic heterocyclic group; R 2 s each independently represent an aliphatic hydrocarbon group having 1 to 10 carbon atoms, a substituted or unsubstituted aromatic hydrocarbon group having 6 to 18 carbon atoms, or a substituted or unsubstituted aromatic heterocyclic group having 3 to 17 carbon atoms, and may each be fused with an adjacent ring to form a fused ring; and a represents an integer of from 1 to 3, c and d each independently represent an integer of from 0 to 4, and j represents an integer of from 0 to 2. 2 is represented by the formula, and in the formula, a ring A is an aromatic hydrocarbon ring represented by the formula, a ring B is a heterocycle represented by the formula, and the ring A and the ring B are each fused with an adjacent ring at arbitrary positions, and X is selected from N-Ar 2, an oxygen atom, and a sulfur atom; Ar 1 and Ar 2 each independently represent a substituted or unsubstituted aromatic hydrocarbon group having 6 to 18 carbon atoms, a substituted or unsubstituted aromatic heterocyclic group having 3 to 17 carbon atoms, or a linked aromatic group formed by linking 2 to 6 aromatic rings of aromatic groups each selected from the aromatic hydrocarbon group and the aromatic heterocyclic group; R 2 s each independently represent an aliphatic hydrocarbon group having 1 to 10 carbon atoms, a substituted or unsubstituted aromatic hydrocarbon group having 6 to 18 carbon atoms, or a substituted or unsubstituted aromatic heterocyclic group having 3 to 17 carbon atoms, and may each be fused with an adjacent ring to form a fused ring; and a represents an integer of from 1 to 3, c and d each independently represent an integer of from 0 to 4, and j represents an integer of from 0 to 2.