An organic electroluminescent (EL) display device includes an anode, a hole transport layer formed on the anode, a light-emitting layer formed on the hole transport layer, a cathode formed on the light-emitting layer, and an electron injection layer including a metal oxide represented by formula 1 formed between the light-emitting layer and the cathode. Formula 1 is MAxMByOz, where MA denotes an alkali metal or alkali earth metal, MB is a group IV or V metal, x is a number between 1 and 2 inclusive, y is a number between 1 and 2, and z is a number between 2 and 3 inclusive.