A housing having a suction port and a discharge port, an impeller 21 and a casing 22 that houses the impeller 21, an air blower 2 housed in the housing, a filter that lets through the air suctioned from the suction port by the air blower 2, and two ion generating sections that generate positive and negative ions are provided. An ion generating section is arranged on a circular-arc guide wall 22a in the casing 22. The positive and negative ions generated by the ion generating section are efficiently included in the air passing through as laminar flow along the circular-arc guide wall 22a. A further ion generation section is arranged on the front wall 4d of a duct 4 configured to guide clean air blown out from casing 22.
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