An organic electroluminescence device comprising: an anode; an emitting layer; and a cathode, the emitting layer comprising a first material, a second material and a third material, the first material being a fluorescent material, characterized in that the second material being a thermally activated delayed fluorescent material, the third material having a singlet energy larger than a singlet energy of the second material, wherein an energy gap Eg 77K (M2) at 77 [K] of the second material is larger than an energy gap Eg 77K (M1) at 77 [K] of the first material, an energy gap Eg 77K (M3) at 77 [K] of the third material is larger than the energy gap Eg 77K (M2) at 77 [K] of the second material, a difference ΔST(M1) between a singlet energy EgS(M1) of the first material and the energy gap Eg 77K (M1) at 77 [K] of the first material satisfies a relationship of a numerical formula (Numerical Formula 2) below, Δ ST M1 = EgS M1 − Eg 77K M1 > 0.3 eV and the energy gap Eg 77K (M1) at 77 [K] of the first material, the energy gap Eg 77K (M3) at 77 [K] of the third material, and the energy gap Eg 77K (M2) at 77 [K] of the second material are each measured as described in the description, with the exception of an organic electroluminescence device according to examples 1 and 3 of EP 3035401 A1, and with the exception of the organic electroluminescence devices according to the examples 6 to 11 of EP 2980877 A1. an anode; an emitting layer; and a cathode, the emitting layer comprising a first material, a second material and a third material, the first material being a fluorescent material, the second material being a thermally activated delayed fluorescent material, the third material having a singlet energy larger than a singlet energy of the second material, wherein an energy gap Eg 77K (M2) at 77 [K] of the second material is larger than an energy gap Eg 77K (M1) at 77 [K] of the first material, an energy gap Eg 77K (M3) at 77 [K] of the third material is larger than the energy gap Eg 77K (M2) at 77 [K] of the second material, a difference ΔST(M1) between a singlet energy EgS(M1) of the first material and the energy gap Eg 77K (M1) at 77 [K] of the first material satisfies a relationship of a numerical formula (Numerical Formula 2) below, Δ ST M1 = EgS M1 − Eg 77K M1 > 0.3 eV and the energy gap Eg 77K (M1) at 77 [K] of the first material, the energy gap Eg 77K (M3) at 77 [K] of the third material, and the energy gap Eg 77K (M2) at 77 [K] of the second material are each measured as described in the description, with the exception of an organic electroluminescence device according to examples 1 and 3 of EP 3035401 A1, and with the exception of the organic electroluminescence devices according to the examples 6 to 11 of EP 2980877 A1. an energy gap Eg 77K (M2) at 77 [K] of the second material is larger than an energy gap Eg 77K (M1) at 77 [K] of the first material, an energy gap Eg 77K (M3) at 77 [K] of the third material is larger than the energy gap Eg 77K (M2) at 77 [K] of the second material, a difference ΔST(M1) between a singlet energy EgS(M1) of the first material and the energy gap Eg 77K (M1) at 77 [K] of the first material satisfies a relationship of a numerical formula (Numerical Formula 2) below, Δ ST M1 = EgS M1 − Eg 77K M1 > 0.3 eV and the energy gap Eg 77K (M1) at 77 [K] of the first material, the energy gap Eg 77K (M3) at 77 [K] of the third material, and the energy gap Eg 77K (M2) at 77 [K] of the second material are each measured as described in the description, with the exception of an organic electroluminescence device according to examples 1 and 3 of EP 3035401 A1, and with the exception of the organic electroluminescence devices according to the examples 6 to 11 of EP 2980877 A1. <EOS>