One embodiment of the present specification provides an organic electroluminescence device comprising: an anode; a cathode; a light-emitting layer provided between the anode and the cathode; and an electron transport layer provided between the cathode and the light-emitting layer, wherein the electron transport layer includes a first electron transport material and a second electron transport material, the first electron transport material is an organic material including a monocyclic or polycyclic ring having an N-containing six-membered ring, the second electron transport material is an organic material including a cyano group or a five-membered heterocyclic ring having at least one heteroatom from among N, O, and S, and a dipole moment of the second electron transport material is larger than a dipole moment of the first electron transport material.