A method of producing an electroluminescent element. Preparing an electrode layer, and forming, on the electrode layer or an electric charge injection transportation layer formed on the electrode layer, a decomposition removal layer. Placing a photocatalyst treatment layer and the decomposition removal layer at an interval of 200 .mu.m or less and conducting pattern irradiation to form the decomposition removal layer into a pattern. Removing the photocatalyst treatment layer from the decomposition removal, and forming an organic electroluminescent layer on the electrode layer or the decomposition removal layer according to the pattern of the decomposition removal layer.