An embodiment of the present disclosure relates to an input device and a method of manufacturing the input device. The input device according to the embodiment includes a main housing including a metal side plate, an interlocking unit pivotably provided in the main housing, and a rotation detection device configured to detect a rotation angle of the interlocking unit, wherein the rotation detection device includes a housing, a sensor electrode provided in the housing, a reference electrode facing the sensor electrode, a movable plate rotatably provided in the housing so as to be disposed between the sensor electrode and the reference electrode, and a shield plate provided on an outer wall of the housing, and wherein the shield plate is connected to a metal side plate of the main housing.