The present invention addresses the problem of providing a fine particle dispersion device having little pressure loss and little noise, and to which foreign matter such as dust and insects does not easily adhere. This fine particle dispersion device (3) is equipped with: an agitation unit (6) that generates concentric swirling currents； fine particle generation units (4, 4) that generate fine particles； separation parts (14, 14, 14, 14) that separate the swirling currents from the agitation unit (6)； and a ventilation hole (13) provided near the outer circumferential part of the agitation unit (6).
