Provide is a display device that prevents adverse effects on pixel circuits, resulting from a process related to a sealing film, and a manufacturing method of the display device. A display device includes pixel circuits on a substrate and a sealing film having a multilayer structure on the pixel circuits. The sealing film includes a first layer being formed in contact with the pixel circuits and being made of a silicon-containing inorganic material. The first layer is a mixed film containing at least one component changing seamlessly in a stacking direction.