A Upon fermentation drying of organic wastes, short processing time, a simple structure, is inexpensive manufacturing cost, with the problem that the maintenance to provide processing apparatus easy Horizontal cylindrical rotary drum is there. A use fermentation drying tank of oblong cylindrical rotary drum type fermentation drying, in the fermentation drying tank of the rotating drum which is mounted horizontally, scraped and arrayed on the inner surface of the barrel portion of the rotary drum and wings comprises a number sequence was stirring blade to the central axis on a support, fixed rotation axis on the rotary drum, when the rotary drum is transported from the feeding portion while reversing the organic waste is rotated to a discharge portion, scraping and transfer of the long distance in the direction of the discharge portion by raising the wing, by a combination of the transfer of a short distance in the direction of the insertion portion by stirring blade, and the overall slow transport in the direction of the discharge portion, and the aerobic fermentation the subsequent drying was as well done. .FIELD 1