Abstract: [PROBLEM] To provide a display device capable of improving the transmittance of light at an opening that passes light while maintaining high reflectivity in a reflective layer. [RESOLUTION MEANS] Use a metal film and an reflection increasing film to configure a reflective layer provided in an element substrate to effectively utilize light of a light source. Leave a silicon nitride film that is one portion of the reflection increasing film in the opening that passes the light of the light source while removing the metal film. At this time, the film thickness of the silicon nitride film in the reflection increasing film is ¼ the wavelength of incident light and, on the other hand, the film thickness of the silicon nitride film in the opening is ½ the wavelength of the incident light. The silicon nitride film that is one portion of the reflection increasing film and a passivation film provided in a top layer of an interlayer dielectric film are laminated in the opening to achieve this structure.