PROBLEM TO BE SOLVED: To obtain an air purifier which carries out an appropriate air purifying operation according to use environment conditions or usage. SOLUTION: An air purifier 1 is provided in a main body case 4 and a main body case 4 having an air supply port 2, an exhaust port 3, and an air passage 6 communicating the air supply port 2 and the exhaust port 3. A blower 5 that is a blower that takes in the indoor air from the air supply port 2 and discharges it from the exhaust port 3, and a plurality of air cleaning means that are provided in the ventilation path 6 and that clean the indoor air taken in from the air supply port 2. A control unit 13 that is a control unit that controls the operation of the certain electrostatic precipitator 8 and the HEPA filter 9 and the blower unit, and that also enables or disables the functions of the plurality of air cleaning units based on the amount of air pollution components in the room. And the control means includes a first air cleaning means and a second air cleaning means of the plurality of air cleaning means when the amount of the air pollution component is larger than the first threshold value and smaller than the second threshold value. Activate the function of the means. [Selection diagram] Figure 1【課題】使用環境条件あるいは使い方に応じた適切な空気清浄動作を実施する空気清浄機を得ること。【解決手段】空気清浄機１は、給気口２と、排気口３と、給気口２と排気口３とを連通する通風路６とを有する本体ケース４と、本体ケース４に設けられ、給気口２から室内空気を取り込み排気口３から排出する送風手段である送風機５と、通風路６に設けられ、給気口２から取り込んだ室内空気を清浄にする複数の空気清浄手段である電気集塵機８およびＨＥＰＡフィルタ９と、送風手段の運転を制御するとともに、室内の空気汚れ成分の量に基づいて複数の空気清浄手段の機能をそれぞれ有効もしくは無効にする制御手段である制御部１３とを備え、制御手段は、空気汚れ成分の量が第１の閾値より多く、第２の閾値より少ない場合に、複数の空気清浄手段のうちの第１の空気清浄手段および第２の空気清浄手段の機能を有効にする。【選択図】図１
