PROBLEM TO BE SOLVED: To provide an air cleaner capable of preventing the generation of abnormal sound when restarting operations.SOLUTION: There is provided an air cleaner which comprises: a housing 500 which has a purifying ventilation passage 52 in which air to be sterilized flows from an upstream side to a downstream side； an atomization device 53 which atomizes a sterilization agent solution to the air to be sterilized flowing through the purifying ventilation passage 52； a circulation tank 54 which receives the sterilization agent solution dropping from the purifying ventilation passage 52； and a circulation system 55 in which the sterilization agent solution flows from the circulation tank 54 to the atomization device 53 only in one direction, in which the atomization device 53 has a main body 532 positioned above the circulation tank 54 and the circulation system 55 and an atomizing nozzle 531 and the tip of the atomizing nozzle 531 opens 531a at a position above the main body.SELECTED DRAWING: Figure 1
