A display device comprising: a substrate including a display region and a non-display region including a plurality of sub-non-display regions (SNDA1-SNDA4) that are respectively extended from the plurality of sides of the display regions and separated from each other; a display layer provided on a surface of the substrate in the display region and including a plurality of pixels; and wiring lines provided in the plurality of sub-non-display regions (SNDA1-SNDA4) on the substrate and electrically connected to the plurality of pixels, wherein the plurality of sub-non-display regions (SNDA1-SNDA4) each comprises: a display connection regions (DCA1-DCA4) connected to the display region; and at least one extension region (NDCA1-NDCA4) extended from a part of the display connection region (DCA1-DCA4), wherein the plurality of sub-non-display regions (SNDA1-SNDA4) are bent and face a surface of the substrate opposite to a surface, on which the display layer is disposed, in the display region, and wherein, when the plurality of sub-non-display regions (SNDA1-SNDA4) is bent, the extension region (NDCA1-NDCA4) of one of the plurality of sub-non-display regions (SNDA1-SNDA4) overlaps the extension region (NDCA1-NDCA4) of another of the plurality of sub-non-display regions (SNDA1-SNDA4) adjacent to the one of the plurality of sub-non-display regions (SNDA1-SNDA4), and at least one circuit board which is connected to at least one of the plurality of sub-non-display regions (SNDA1-SNDA4) and applies a signal to the wiring lines, characterized in that when the plurality of sub-non-display regions (SNDA1-SNDA4) is bent, all of the wiring lines of the sub-non-display regions are electrically connected to each other and to the circuit board. a substrate including a display region and a non-display region including a plurality of sub-non-display regions (SNDA1-SNDA4) that are respectively extended from the plurality of sides of the display regions and separated from each other; a display layer provided on a surface of the substrate in the display region and including a plurality of pixels; and wiring lines provided in the plurality of sub-non-display regions (SNDA1-SNDA4) on the substrate and electrically connected to the plurality of pixels, wherein the plurality of sub-non-display regions (SNDA1-SNDA4) each comprises: a display connection regions (DCA1-DCA4) connected to the display region; and at least one extension region (NDCA1-NDCA4) extended from a part of the display connection region (DCA1-DCA4), wherein the plurality of sub-non-display regions (SNDA1-SNDA4) are bent and face a surface of the substrate opposite to a surface, on which the display layer is disposed, in the display region, and wherein, when the plurality of sub-non-display regions (SNDA1-SNDA4) is bent, the extension region (NDCA1-NDCA4) of one of the plurality of sub-non-display regions (SNDA1-SNDA4) overlaps the extension region (NDCA1-NDCA4) of another of the plurality of sub-non-display regions (SNDA1-SNDA4) adjacent to the one of the plurality of sub-non-display regions (SNDA1-SNDA4), and at least one circuit board which is connected to at least one of the plurality of sub-non-display regions (SNDA1-SNDA4) and applies a signal to the wiring lines, characterized in that when the plurality of sub-non-display regions (SNDA1-SNDA4) is bent, all of the wiring lines of the sub-non-display regions are electrically connected to each other and to the circuit board. a display connection regions (DCA1-DCA4) connected to the display region; and at least one extension region (NDCA1-NDCA4) extended from a part of the display connection region (DCA1-DCA4), wherein the plurality of sub-non-display regions (SNDA1-SNDA4) are bent and face a surface of the substrate opposite to a surface, on which the display layer is disposed, in the display region, and wherein, when the plurality of sub-non-display regions (SNDA1-SNDA4) is bent, the extension region (NDCA1-NDCA4) of one of the plurality of sub-non-display regions (SNDA1-SNDA4) overlaps the extension region (NDCA1-NDCA4) of another of the plurality of sub-non-display regions (SNDA1-SNDA4) adjacent to the one of the plurality of sub-non-display regions (SNDA1-SNDA4), and at least one circuit board which is connected to at least one of the plurality of sub-non-display regions (SNDA1-SNDA4) and applies a signal to the wiring lines, characterized in that when the plurality of sub-non-display regions (SNDA1-SNDA4) is bent, all of the wiring lines of the sub-non-display regions are electrically connected to each other and to the circuit board.