Provided is a display device including a substrate having a first region and a second region adjacent to the first region. The second region is located in a direction from the first region to an outside of the substrate. The first region possesses a transistor, a leveling film over the transistor, and a light-emitting element over the leveling film and electrically connected to the transistor. The display device further includes a plurality of metal films in the second region and a sealing film. The plurality of metal films includes at least one of Group 1 metal elements and Group 2 elements, and the leveling film is arranged so as to be confined in the first region.