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 at 77 of the second material is larger than an energy gap Eg 77K at 77 of the first material, an energy gap Eg 77K at 77 of the third material is larger than the energy gap Eg 77K at 77 of the second material, a difference ΔST between a singlet energy EgS of the first material and the energy gap Eg 77K at 77 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 at 77 of the first material, the energy gap Eg 77K at 77 of the third material, and the energy gap Eg 77K at 77 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 at 77 of the second material is larger than an energy gap Eg 77K at 77 of the first material, an energy gap Eg 77K at 77 of the third material is larger than the energy gap Eg 77K at 77 of the second material, a difference ΔST between a singlet energy EgS of the first material and the energy gap Eg 77K at 77 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 at 77 of the first material, the energy gap Eg 77K at 77 of the third material, and the energy gap Eg 77K at 77 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 at 77 of the second material is larger than an energy gap Eg 77K at 77 of the first material, an energy gap Eg 77K at 77 of the third material is larger than the energy gap Eg 77K at 77 of the second material, a difference ΔST between a singlet energy EgS of the first material and the energy gap Eg 77K at 77 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 at 77 of the first material, the energy gap Eg 77K at 77 of the third material, and the energy gap Eg 77K at 77 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.