An organic EL device includes a substrate; an organic EL element formed on the substrate; and a sealing film formed on the organic EL element, wherein the sealing film is a silicon nitride film containing from 0.85 to 0.95 at % H. A method of manufacturing the organic EL device, includes the steps of: forming an organic EL element on a substrate; and forming a sealing film on the organic EL element in a process including mixing SiH4, NH3, N2, and H2, during which the H2 is introduced at a flow rate set to from 1 to 5 volume percent of that of the N2, so that a silicon nitride film containing hydrogen atoms or hydrogen molecules is formed.