An organic light emitting device that includes a cathode, an anode and an organic layer arranged between the cathode and the anode, wherein the cathode includes at least one metal layer and at least one inorganic electrode layer alternately arranged, the cathode includes at least three layers. The organic light emitting device has excellent luminous efficiency, luminance, color coordinate characteristic, power efficiency and an increased lifetime while preventing the cathode electrode from diffusing into the organic emitting layer.