To provide an air treatment device that can reduce the number of times of ON/OFF and electric energy consumption in a case where a plurality of heaters are used for a deodorizing device.

An air treatment device according to the present invention includes: a fan 3 provided in an air duct; a fin with a deodorant using a catalyst carried on the surface thereof; a plurality of heaters 20 for heating the fin; a relay for changing ON/OFF for each of the plurality of heaters; detection means 15 for detecting a temperature of the fin; and control means 12 for controlling ON/OFF of the heaters. The plurality of heaters includes: at least one reference heater. The control means repeats control to turn ON the reference heater when a detection temperature becomes a lower limit target temperature, and to turn OFF the reference heater when becoming the upper limit target temperature. The control means controls the timing of ON/OFF of the heater other than the reference heater is shifted from the timing of ON/OFF of the reference heater by (1/n)*T, where the time of the last time period is T and the number of heaters is n.