A portable electronic device comprising: a housing; a user input unit configured to detect touch input and push input; and a carrier, on which the user input unit is seated and which is positioned inside of the housing, wherein the user input unit comprises: a first board disposed on an inner surface of the housing a first input unit mounted on a first surface of the first board and configured to detect a touch input; and a second input unit mounted on a second surface of the first board in the state of overlapping the first input unit and configured to detect a push input different from the touch input, wherein the second input unit includes: a first electrode positioned on the second surface of the first board; a second electrode disposed on the second surface of the first board, wherein the first electrode and the second electrode are spaced apart from each other, and a metal spring configured to be changed in shape in response to the push input, wherein the metal spring is grounded; wherein the metal spring includes a cover portion covering the second input unit and a connection portion connected to the first board such that the cover portion is spaced apart from the first board, and wherein the push input of second input unit is detected by detecting a variation in a distance between (a) the first and second electrodes (3721, 3722) and (b) the metal spring based on a variation in an intensity of an electrical field between the first electrode and the second electrode. a housing; a user input unit configured to detect touch input and push input; and a carrier, on which the user input unit is seated and which is positioned inside of the housing, wherein the user input unit comprises: a first board disposed on an inner surface of the housing a first input unit mounted on a first surface of the first board and configured to detect a touch input; and a second input unit mounted on a second surface of the first board in the state of overlapping the first input unit and configured to detect a push input different from the touch input, wherein the second input unit includes: a first electrode positioned on the second surface of the first board; a second electrode disposed on the second surface of the first board, wherein the first electrode and the second electrode are spaced apart from each other, and a metal spring configured to be changed in shape in response to the push input, wherein the metal spring is grounded; wherein the metal spring includes a cover portion covering the second input unit and a connection portion connected to the first board such that the cover portion is spaced apart from the first board, and a first board disposed on an inner surface of the housing a first input unit mounted on a first surface of the first board and configured to detect a touch input; and a second input unit mounted on a second surface of the first board in the state of overlapping the first input unit and configured to detect a push input different from the touch input, wherein the second input unit includes: a first electrode positioned on the second surface of the first board; a second electrode disposed on the second surface of the first board, wherein the first electrode and the second electrode are spaced apart from each other, and a metal spring configured to be changed in shape in response to the push input, wherein the metal spring is grounded; wherein the metal spring includes a cover portion covering the second input unit and a connection portion connected to the first board such that the cover portion is spaced apart from the first board, and a first electrode positioned on the second surface of the first board; a second electrode disposed on the second surface of the first board, wherein the first electrode and the second electrode are spaced apart from each other, and a metal spring configured to be changed in shape in response to the push input, wherein the metal spring is grounded; wherein the metal spring includes a cover portion covering the second input unit and a connection portion connected to the first board such that the cover portion is spaced apart from the first board, and