To prevent the degradation in adsorption performance for a long period of time while suppressing the complication of device constitution and an increase of its cost with an air cleaning device (1) which cleans indoor air by an adsorption member (10) and reproduces the member (10) adsorbed with odorous components and hazardous components with high temperature air.

A photocatalyst is included in the adsorption member (10) and is activated by irradiating the adsorption member (10) with light. The adsorption member (10) is maintained in a clean state by the effect of cracking dirt by the photocatalyst, by which the adsorption performance is assured.