The present invention provides an organic EL device including: a substrate; a stacked structure having at least a first electrode, a light-emitting layer and a second electrode; a sealing member for sealing the substrate and the stacked structure; and a filling layer which enables easy optical adjustment and has optical properties equal to the optical properties of surrounding materials while preventing moisture from entering in the EL device, wherein a layer containing a water-polymerizable monomer is provided between the stacked structure and the sealing member.