PURPOSE: To prevent the emission of odor due to an anaerobic state resuliting from the wood chips gathered into a mass and the lowering of the efficiency of treating organic substances, adsorb the odor in a treating tank by activated carbons and reduce the uncomfortable feeling of a user when the organic substance such as garbage is placed in a treating device by filling the treating tank with a mixture of the wood chips and the activated carbons as a microorganism cuture carrier.

CONSTITUTION: In an organic substance-treating device wherein the organic substances are placed and decomposed and composted by microorganisms, etc., a microorganism culture carrier 63 is composed of a mixture of small wood chips and activated carbons.