A display device includes a pixel array disposed on a base substrate, a side terminal electrically connected to the pixel array, a connection pad including a first side surface contacting a side surface of the side terminal, and a driving device bonding to a second side surface of the connection pad, where the second side surface is opposite to the first side surface. The side terminal includes a resistance-reducing layer and an upper conductive layer, the resistance-reducing layer includes a first conductive material, the upper conductive layer is disposed on the resistance-reducing layer and includes a second conductive material having an oxidation resistance greater than the first conductive material. A portion of the upper conductive layer is disposed between the connection pad and the resistance-reducing layer such that the resistance-reducing layer is spaced apart from the connection pad.