To provide a cleaning device for an suction filter in a supercharger, capable of easily cleaning the filter by simple work, even during operation of an engine without having to remove the filter from a supercharger main unit.

This cleaning device, removing dust from an air suction filter mounted in a supercharger supplying air to a combustor of a margin engine for cleaning the filter, comprises a rotatably journalled arm, a nozzle mounted in the arm movably along a reverse surface of the filter, a means supplying pressure gas to this nozzle, a means supplying cleaning liquid to the nozzle, and a dust receiver provided movably along a surface of the filter to follow up the nozzle to receive foreign matter detached from the filter.