To improve reliability of a light emitting device where a TFT is coupled with an organic light emitting element.

As components of a light emitting device 1200, a TFT 1201 and an organic light emitting element 1202 are formed on the same substrate 1203. A first insulating film 1205 functioning as a blocking layer is formed on the substrate 1203 side of the TFT 1201, and a second insulating film 1206 is formed as a protective film on the opposite upper layer side. On the lower layer side of the organic light emitting element 1202, a third insulating film 1207 functioning as a barrier film is formed. The third insulating film 1207 is formed from such inorganic insulating film as a silicon nitride film, a silicon oxynitride film, an aluminum nitride, aluminum oxide, and aluminum oxynitride. A fourth insulating film 1208 and a barrier wall layer 1209 formed on the upper layer side of the organic light emitting element 1202 are formed from the same inorganic insulating film.

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