To efficiently deodorize by increasing a surface area with a small amount of diatomaceous earth neither taking space nor using electricity or the like although a conventional room and cabin are deodorized by an air cleaner or the like using electricity or the like.

The plate with diatomaceous earth applied thin to a honeycomb-like plate such as a paper is installed at the upper part of a ceiling or the like to adsorb and deodorize rising smell without using energy of electricity or the like at all.