A display device including a display panel having a plurality of signal wirings disposed on a side surface, each of the signal wirings including a first surface and a second surface different from the first surface; and a printed circuit board attached to the side surface of the display panel and including a base film and a plurality of lead wirings disposed on one surface of the base film. Each of the lead wirings includes a first lead portion and a second lead portion having a thickness less than that of the first lead portion. The first lead portion is bonded to the second surface, and the second lead portion is bonded to the first surface.