A wiper driving apparatus comprising: a windshield; a sensor unit attached to a first surface of the windshield and having impedance value changed by an object contacting a second surface of the windshield; and a control unit adapted to receive a sensing signal corresponding to a variation amount of the impedance value through the sensor unit, adapted to determine the presence of rainfall based on the received sensing signal, and adapted to drive wiper depending on the determined presence of rainfall, wherein the sensor unit comprises: a substrate; a sensing electrode formed on a first surface of the substrate; a reaction layer formed on the first surface of the substrate to bury an upper surface of the substrate and the sensing electrode and including a carbon micro-coil material, a resin and a dispersant; a driving unit electrically connected to the sensing electrode formed on the first surface of the substrate and processing a sensing signal transmitted through the sensing electrode; and a protective layer formed surrounding the driving unit, wherein an impedance value of the reaction layer is changed in accordance with at least any one of a change of a dielectric constant and a force caused by the contact object, and the sensing electrode transmits the sensing signal with respect to a variation amount of the impedance value of the reaction layer to the driving unit. a windshield; a sensor unit attached to a first surface of the windshield and having impedance value changed by an object contacting a second surface of the windshield; and a control unit adapted to receive a sensing signal corresponding to a variation amount of the impedance value through the sensor unit, adapted to determine the presence of rainfall based on the received sensing signal, and adapted to drive wiper depending on the determined presence of rainfall, wherein the sensor unit comprises: a substrate; a sensing electrode formed on a first surface of the substrate; a reaction layer formed on the first surface of the substrate to bury an upper surface of the substrate and the sensing electrode and including a carbon micro-coil material, a resin and a dispersant; a driving unit electrically connected to the sensing electrode formed on the first surface of the substrate and processing a sensing signal transmitted through the sensing electrode; and a protective layer formed surrounding the driving unit, a substrate; a sensing electrode formed on a first surface of the substrate; a reaction layer formed on the first surface of the substrate to bury an upper surface of the substrate and the sensing electrode and including a carbon micro-coil material, a resin and a dispersant; a driving unit electrically connected to the sensing electrode formed on the first surface of the substrate and processing a sensing signal transmitted through the sensing electrode; and a protective layer formed surrounding the driving unit, wherein an impedance value of the reaction layer is changed in accordance with at least any one of a change of a dielectric constant and a force caused by the contact object, and the sensing electrode transmits the sensing signal with respect to a variation amount of the impedance value of the reaction layer to the driving unit.