A wiper driving apparatus comprising: a sensor unit including a carbon micro coil; a rainfall sensing unit for outputting an output value corresponding to a difference value between a first frequency according to change in an impedance value of the sensor unit and a predetermined second frequency; and a controller for determining presence/absence of rain and an amount of rainfall using the output value output from the rainfall sensing unit and determining a wiper driving condition according to the result of determination, wherein the rainfall sensing unit comprises: a first frequency generator for outputting the first frequency having an oscillation frequency as a function of the impedance of the sensor unit; a second frequency generator for outputting the second frequency corresponding to a predetermined reference oscillation frequency; a difference frequency generator for outputting a difference value between the first frequency and the second frequency; and a filter for filtering the difference value output from the difference frequency generator within a predetermined filtering region, wherein the controller is configured to determine that the difference value is generated by a foreign material and not rainwater if the difference value is outside of said filtering region, and determine a driving condition of a wiper according to the difference value when the difference value is generated by rainwater, and wherein the first frequency is changed in correspondence with change in inductance value of the carbon micro coil according to presence or absence of rain and the amount of rainfall. a sensor unit including a carbon micro coil; a rainfall sensing unit for outputting an output value corresponding to a difference value between a first frequency according to change in an impedance value of the sensor unit and a predetermined second frequency; and a controller for determining presence/absence of rain and an amount of rainfall using the output value output from the rainfall sensing unit and determining a wiper driving condition according to the result of determination, wherein the rainfall sensing unit comprises: a first frequency generator for outputting the first frequency having an oscillation frequency as a function of the impedance of the sensor unit; a second frequency generator for outputting the second frequency corresponding to a predetermined reference oscillation frequency; a difference frequency generator for outputting a difference value between the first frequency and the second frequency; and a filter for filtering the difference value output from the difference frequency generator within a predetermined filtering region, wherein the controller is configured to determine that the difference value is generated by a foreign material and not rainwater if the difference value is outside of said filtering region, and determine a driving condition of a wiper according to the difference value when the difference value is generated by rainwater, and wherein the first frequency is changed in correspondence with change in inductance value of the carbon micro coil according to presence or absence of rain and the amount of rainfall. a first frequency generator for outputting the first frequency having an oscillation frequency as a function of the impedance of the sensor unit; a second frequency generator for outputting the second frequency corresponding to a predetermined reference oscillation frequency; a difference frequency generator for outputting a difference value between the first frequency and the second frequency; and a filter for filtering the difference value output from the difference frequency generator within a predetermined filtering region, wherein the controller is configured to determine that the difference value is generated by a foreign material and not rainwater if the difference value is outside of said filtering region, and determine a driving condition of a wiper according to the difference value when the difference value is generated by rainwater, and wherein the first frequency is changed in correspondence with change in inductance value of the carbon micro coil according to presence or absence of rain and the amount of rainfall.