A touch input device capable of detecting a touch pressure, the touch input device comprising: a display panel having a pressure electrode (450, 460; 455), a reference potential layer which is formed separately from the pressure electrode (450, 460; 455), a cover layer which is disposed on the display panel, and a substrate which is disposed under the display panel, wherein the pressure electrode (450, 460; 455) is formed on a back side of the display panel for detecting the pressure, wherein the substrate comprises the reference potential layer, wherein the touch input device detects the touch pressure on the basis of a capacitance change amount according to a change of a distance between the pressure electrode (450, 460; 455) and the reference potential layer, wherein, when a pressure is applied to the touch input device, the cover layer and the display panel are bent, so that the distance between the pressure electrode (450, 460; 455) and the reference potential layer is changed, wherein when no pressure is applied to the touch input device, a predetermined distance between the pressure electrode (450, 460; 455) and the reference potential layer is maintained by a support member disposed only on a circumference of the substrate a display panel having a pressure electrode (450, 460; 455), a reference potential layer which is formed separately from the pressure electrode (450, 460; 455), a cover layer which is disposed on the display panel, and a substrate which is disposed under the display panel, wherein the pressure electrode (450, 460; 455) is formed on a back side of the display panel for detecting the pressure, wherein the substrate comprises the reference potential layer, wherein the touch input device detects the touch pressure on the basis of a capacitance change amount according to a change of a distance between the pressure electrode (450, 460; 455) and the reference potential layer, wherein, when a pressure is applied to the touch input device, the cover layer and the display panel are bent, so that the distance between the pressure electrode (450, 460; 455) and the reference potential layer is changed, wherein when no pressure is applied to the touch input device, a predetermined distance between the pressure electrode (450, 460; 455) and the reference potential layer is maintained by a support member disposed only on a circumference of the substrate wherein the pressure electrode (450, 460; 455) is formed on a back side of the display panel for detecting the pressure, wherein the substrate comprises the reference potential layer, wherein the touch input device detects the touch pressure on the basis of a capacitance change amount according to a change of a distance between the pressure electrode (450, 460; 455) and the reference potential layer, wherein, when a pressure is applied to the touch input device, the cover layer and the display panel are bent, so that the distance between the pressure electrode (450, 460; 455) and the reference potential layer is changed, wherein when no pressure is applied to the touch input device, a predetermined distance between the pressure electrode (450, 460; 455) and the reference potential layer is maintained by a support member disposed only on a circumference of the substrate