PROBLEM TO BE SOLVED: To reduce power consumption of an air conditioner.SOLUTION: When the amount of dust detected by a dust detection sensor 360 is below a predetermined amount (S110), an air conditioner is switched into a second operation state (S111) in which an electrical dust collector 200 (dust collection auxiliary means) is in the suspended state and a streamer discharge unit 340 (active species supply means) is in the operation state. Further, when the amount of dust detected by the dust detection sensor 360 is below the predetermined amount and the odor intensity detected by an odor detection sensor 370 is below a predetermined intensity (S102), the air conditioner is switched into a third operation state (S103) in which the electrical dust collector 200 (dust collection auxiliary means) and the streamer discharge unit 340 (active species supply means) are both in the suspended state.【課題】空気調和機の消費電力を低減する。【解決手段】空気調和機は、塵埃検出センサ３６０で検出された塵埃量が所定量未満である場合に（Ｓ１１０）、電気集塵装置２００（集塵補助手段）が停止状態であってストリーマ放電ユニット３４０（活性種供給手段）が運転状態である第２運転状態に切り換える（Ｓ１１１）。また、塵埃検出センサ３６０で検出された塵埃量が所定量未満でありかつ臭い検出センサ３７０で検出された臭い強度が所定強度未満である場合に（Ｓ１０２）、電気集塵装置２００（集塵補助手段）及びストリーマ放電ユニット３４０（活性種供給手段）がいずれも停止状態である第３運転状態に切り換える（Ｓ１０３）。【選択図】図１１
