A method for manufacturing an organic EL apparatus includes forming an organic EL element and a mounting terminal on a substrate of an element substrate as a first substrate, forming sealing films so as to cover at least the organic EL element and the mounting terminal, adhering a sealing substrate as a second substrate with respect to the element substrate using a filler, and etching the sealing films so as to expose at least a part of the mounting terminal, in which, in the etching of the sealing films, the second substrate, which is formed with a composition which reacts with an etching gas and vaporizes, or a protective member, which covers at least a part of the second substrate, is used as a mask.