To provide a removal device for impurities in which impurities in air are efficiently removed by a removal means of impurities.

A removal means 2 of impurities which is provided in an air duct 1 is constituted of material having liquid-retaining properties and provided so as to be rotated in the direction crossing an air current flowing through the air duct 1. Liquid supplied from liquid feed means 3 to the removal means 2 is uniformly distributed in the whole by rotation of the removal means 2 of impurities and also it is prevented that the air current flowing through the air duct 1 is disturbed. Further, the liquid feed means 3 are provided by approaching to the central part on the upstream side of the removal means 2 of impurities or formed into a spray nozzle for spraying liquid in a misty state on the upstream side of the removal means 2 of impurities.