An air purifier includes: a case having an air inlet and an air outlet； a tank that stores a liquid, the tank disposed in the case； a plasma generator that generates a plasma which is to be in contact with the liquid, the plasma generator including a pair of electrodes and a power supply which applies a voltage between the pair of electrodes； a fan that generates an air flow from the air inlet to the air outlet； a filter through which the air flow comes into contact with the liquid, the filter disposed in the case； and a controller that causes the power supply to start application of the voltage, and causes the fan to start generation of the air flow after elapse of a predetermined time period since the start of the application of the voltage.
