PURPOSE: To provide a deodorizing device having a stable deodorizing efficiency without necessity of replenishing the device with an activated carbon in the device principally removing hydrogen sulfide with sodium hydroxide, as a reactant, and the activated carbon, as a catalyst.

CONSTITUTION: The ultrafiltration membrane device 11 recovering an activated carbon catalyst 9 together with filtering and discharging a blow solution 13 from a liquid chemicals circulating vessel 10 is provided inside the liquid chemicals circulating vessel 10 or outside the liquid chemicals circulating vessel 10.