To solve the problem that when an organic electroluminescent element substrate, which comprises a substrate, pixel electrodes formed on the substrate, organic light emitting medium layers with organic light emitting layers providing different colors of light on the pixel electrodes, and opposed electrodes opposed to the pixel electrodes through the organic light emitting medium layer, has a partition and a sealing base material is stuck on all over the effective pixel of the organic EL element substrate with an adhesive, air mixes during the adhesion due to irregularity of the partition, and then to provide an organic EL element which does not mix air during the adhesion of the sealing base material on the element substrate all over the effective pixel.

A organic electroluminescent element substrate of which height difference in the effective pixel is 1 μm or less is used.

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