It is an object of the present invention to reproduce the deodorization performance of a deodorization functional agent by decomposing odor and harmful gas components adsorbed to the deodorization functional agent not only reliably and simply in a short period of time, but also without generating polluted water. A deodorization function reproducing device (1) is a deodorization function reproducing device for performing a reproducing process of a deodorizing agent (4) that has adsorbed at least one of odor molecules or harmful gas components that are floating in the air. The deodorization function reproducing device (1) includes a casing (2), and an active species generating portion (3). The casing can store the deodorizing agent. The active species generating portion generates active species to decompose or inactivate at least one of the odor molecules or harmful gas components.