A manufacturing method of a display device according to an embodiment of the present invention includes: a display panel forming process to provide a display panel includes the flexible base material, the plurality of pixels, and a display area, a display panel bending process to bend a part adjacent to the display area of the display panel and form a bent area, and arrange a part opposite to the display area with respect to the bent area to be opposed to the display area, a filling process to fill, by liquid adhesive, a space on the inner surface side that is in the bent area and that is the surface side of the display panel opposite to the surface on which the plurality of pixels are arranged on the flexible base material, and a curing process to cure the liquid adhesive and form an adhesive layer.