PURPOSE: A drier is provided to minimize the contamination of a sensor for securing the long-term prediction efficiency of the estimate drying time of the drier. CONSTITUTION: A drier comprises the following: a front side supporting unit(204) installed on an inlet of a drum(202); a rear side supporting unit installed on the opposite side of the inlet; an exhaust pipe(310) discharging internal air from the drum; and a moisture sensor(210) installed on the front side supporting unit, and closely located around the exhaust pipe for detecting the humidity in air inserted into the exhaust pipe.
