An air cleaner includes: a generation unit configured to discharge an electric current by being applied with a high voltage, and generate a plurality of types of discharge products; an air-sending device configured to form a flow of air, and spray the plurality of types of discharge products generated from the generation unit to a space; an estimation unit configured to estimate an amount of dust floating in the space by selecting whether an amount of dust floating in the space is a first estimation amount smaller than a predetermined threshold or is a second estimation amount larger than or equal to the predetermined threshold and larger than the first estimation amount; and a control unit configured to control a generation amount of the plurality of types of discharge products to be generated from the generation unit based on the amount of dust estimated by the estimation unit.