A display device includes a first substrate including first and second surfaces facing each other, and including at least one opening penetrating the first and second surfaces; an inspection array disposed on the first surface and exposed on the second surface by the opening; a pixel circuit layer disposed on the first surface and including at least one transistor and an outer line; and a display element layer disposed on the pixel circuit layer and including a light emitting element electrically connected to the transistor. The inspection array is electrically connected to the outer line.