To reduce the thickness of a display.

This spontaneous luminous type display device is constituted by connecting a flexible substrate 5 for signal transmission to a terminal array 7 disposed in proximity to the side edge of a spontaneous luminous display board 4 of a thin type, in which the flexible substrate 5 is directly inwardly extended so as to comply with the surface of the spontaneous luminous display board from a juncture 50 to the terminal array 47. Curved parts do not exist at the flexible substrate 5 near the juncture 50 to the terminal array 47 and the segments projecting to the outer side from the contours of the spontaneous luminous display board 4 do not exist. The spontaneous luminous type display device of the thin thickness can therefore be completed by taking advantage of the thin type of the spontaneous luminous display board 4.