Display device and manufacturing method thereof

In an organic EL display device, an improvement in the performance of a barrier film that blocks entry of a substance that causes degradation, such as moisture, into an organic electroluminescent element is achieved. The organic EL display device includes the barrier film, which is a stacked film including a barrier base material layer made of silicon oxide or silicon nitride and a base material coating layer in contact with an impregnated barrier base material layer. The barrier film blocks transmission of a substance that degrades the organic electroluminescent element. Nano-ink is applied on a surface of the barrier base material layer, and the barrier base material layer is impregnated with the nano-ink. The barrier base material layer subjected to the impregnation treatment serves as the impregnated barrier base material layer, while the nano-ink after impregnation serves as the base material coating layer.