PROBLEM TO BE SOLVED: To provide a ventilation device etc. which can introduce only an amount of outdoor air, which is needed to achieve sufficient cleanliness of indoor air, into an indoor space after particulate substances are removed therefrom with a discharge type dust collector and can inhibit unnecessary electric discharge in the dust collector.SOLUTION: A ventilation device according to the invention includes: an inlet port 12 for taking outdoor air into the device； an outlet port 13 for blowing the air introduced from the inlet port 12 into an indoor space； a dust collector 100 disposed in an air channel leading from the inlet port 12 to the outlet port 13； an indoor dirt sensor 22 which detects an amount of dirt in indoor air. The dust collector 100 has: an electric charge part 110 which charges particulate substances in the passing air； a power supply part 120 which applies voltage to the electric charge part 110； and a collection part 130 which collects the particulate substances charged by the electric charge part 110. The power supply part 120 of the dust collector 100 applies the voltage to the electric charge part 110 according to the amount of the dirt in the indoor air.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2020,JPO&INPIT【課題】室内の空気の清浄度を十分なものとするために必要な分だけ、放電式の集塵装置により屋外の空気から粒子状物質を取り除いて室内に導入でき、集塵装置での不必要な放電を抑制可能な換気装置等を提供する。【解決手段】この発明に係る換気装置は、屋外の空気を取り入れるための吸込口１２と、吸込口１２から導入した空気を室内に吹き出すための吸込口１２と、吸込口１２から吹出口１３に通じる風路に配置される集塵装置１００と、室内の空気の汚れ量を検出する室内汚れセンサ２２と、を備える。集塵装置１００は、通過する空気中の粒子状物質を帯電させる荷電部１１０、荷電部１１０に電圧を印加する電源部１２０及び荷電部１１０により帯電された粒子状物質を捕集する捕集部１３０を有する。集塵装置１００の電源部１２０は、室内の空気の汚れ量に応じて荷電部１１０に電圧を印加する。【選択図】図１
