To solve the problem that (1) the neighborhood is troubled and the method is regarded as ineffective in the case of bad weather, (2) the odor of a used perfume is too strong and (3) the method has no immediate effect on deodorization although (1) a malodorous substance is discharged outside a room by ventilation, (2) a deodorizing material, with which the perfume is blended, is scattered and (3) a water-soluble biological enzyme is scattered as methods, in which an odor generated from dung from a domestic animal and compost or the like is deodorized.

Diatomaceous earth is blended with the building material having a required shape or diatomaceous earth is blended with paints, the building material or paints are executed into the building such as a cattle shed, and the malodorous substance such as ammonia, trimethylamine, isovaleic acid, hydrogen sulfide or the like is adsorbed and deodorized.