An organic light-emitting device includes an anode electrode and a cathode electrode that are arranged facing each other; a light-emitting layer arranged between the anode electrode and the cathode electrode; and a hole transport layer arranged between the anode electrode and the light-emitting layer, contacting the light-emitting layer. The light-emitting layer includes a first host material and a second host material. An energy difference ΔE1 between a HOMO energy level of the first host material and a HOMO energy level 13H of the hole transport layer 14aH is less than an energy difference ΔE2 between a HOMO energy level 14bH of the second host material and the HOMO energy level 13H of the hole transport layer. The difference between the HOMO energy level 13H of the hole transport layer and the HOMO energy level 14aH of the first host material is 0.37 eV or less.