An input device which inputs a position to an electronic apparatus which receives a touch signal, the input device comprising: a conductive tip (110, 310) configured to receive an electric field transmission signal generated from at least one electrode of the electronic apparatus; a circuit configured to generate an electric field response signal corresponding to the electric field transmission signal; a variable capacitor disposed between the conductive tip (110, 310) and the circuit and configured to vary the electric field response signal according to writing pressure applied to the conductive tip (110, 310); a case in which the circuit and the variable capacitor are disposed; and a movable member which is slidably disposed in the case and coupled at one end to the conductive tip (110, 310); wherein the variable capacitor includes a first electrode (126, 321) and a second electrode (127, 322) coupled to the circuit, a conductive variable electrode (123, 325) disposed to face the first electrode (126, 321), and a dielectric (125, 323) disposed between the first electrode (126, 321) and the conductive variable electrode (123, 325); the first electrode (126, 321) and the second electrode (127, 322) are fixed to the case; the variable electrode (123, 325) is coupled to another end of the movable member, and the moveable member is coupled to the second electrode (127, 322) through an elastic member; and a contact area of the conductive variable electrode (123, 325) with the dielectric is variable; characterised in that the movable member is conductive; and the conductive movable member is elastically disposed in the case through a second elastic member repellant by pressure applied through the conductive tip (110, 310). a conductive tip (110, 310) configured to receive an electric field transmission signal generated from at least one electrode of the electronic apparatus; a circuit configured to generate an electric field response signal corresponding to the electric field transmission signal; a variable capacitor disposed between the conductive tip (110, 310) and the circuit and configured to vary the electric field response signal according to writing pressure applied to the conductive tip (110, 310); a case in which the circuit and the variable capacitor are disposed; and a movable member which is slidably disposed in the case and coupled at one end to the conductive tip (110, 310); wherein the variable capacitor includes a first electrode (126, 321) and a second electrode (127, 322) coupled to the circuit, a conductive variable electrode (123, 325) disposed to face the first electrode (126, 321), and a dielectric (125, 323) disposed between the first electrode (126, 321) and the conductive variable electrode (123, 325); the first electrode (126, 321) and the second electrode (127, 322) are fixed to the case; the variable electrode (123, 325) is coupled to another end of the movable member, and the moveable member is coupled to the second electrode (127, 322) through an elastic member; and a contact area of the conductive variable electrode (123, 325) with the dielectric is variable; characterised in that the movable member is conductive; and the conductive movable member is elastically disposed in the case through a second elastic member repellant by pressure applied through the conductive tip (110, 310).