A circuit board, a display device including the same, and a method of manufacturing a circuit board are provided. A circuit board includes a base substrate, a wiring line provided on the base substrate, a passivation layer provided on the wiring line, an elastic bump provided on the passivation layer, and a conductive layer provided on the elastic bump. The passivation layer includes a first opening and a second opening that expose a partial region of the wiring line, and the second opening is arranged in a region adjacent to the first opening.