To provide an apparatus and a method for separating unburnt carbon, by each of which unburnt carbon is recovered efficiently so that energy cost can be reduced and the unburnt carbon-separated/removed coal ash can be reused, for example, as a subsidiary raw material of concrete.

This apparatus for separating unburnt carbon contained in coal ash is provided with: an ultrasonic sieve having a sieving net to be charged positively by impressing voltage and a vibrating frame for vibrating the sieving net; and an electric dust collector having an electrode to be charged positively by impressing voltage.