An organic electroluminescent device includes a substrate on which a pixel region is disposed, and a partition structure including a stack of an inorganic partition made of an inorganic material and an organic partition made of an organic material, and an inorganic protective layer made of an inorganic material covering the surfaces of the organic partition. The partition structure surrounds the pixel region. A pixel electrode is in contact with the partition structure. An organic luminescent layer is disposed over the pixel electrode and covered with a cathode.