An organic electroluminescent device (100) includes a substrate (1), a driving circuit layer (2), an inorganic protective layer (Pa), an organic flattening layer (Pb), an organic electroluminescent element layer (3), and a TFE structure (10). The TFE structure includes a first inorganic barrier layer (12), an organic barrier layer (14), and a second inorganic barrier layer (16). As seen in a direction of normal to the substrate, the organic flattening layer (Pb) is formed in a region where the inorganic protective layer (Pa) is formed, organic electroluminescent elements are located in a region where the organic flattening layer (Pb) is formed, and an outer perimeter of the TFE structure (10) crosses lead wires (32) and is present between an outer perimeter of the organic flattening layer (Pb) and an outer perimeter of the inorganic protective layer (Pa). In a region where the inorganic protective layer (Pb) and the first inorganic barrier layer (12) are in direct contact with each other on the lead wires (32), a tapering angle θ(12) of a side surface of a cross-section of the first inorganic barrier layer (12) taken along a plane parallel to a width direction of the lead wires (32) is smaller than 90 degrees.