To solve the problem needing a wide installation area and with a low charging rate in conventional methods.

Plural stirring protrusions 23 are formed, and a freely rotatable and cylindrical rotary inner cylinder 1 wholly made from a heat resistance steel is vertically installed. A fixed outer cylinder 2 having plural fixed protrusions 24 installed in the inside surface, plural gas-discharging nozzles 32 installed in the upper side surface and a diaphragm 33 installed in the outer part of the side surface at the upper part is fixed so as to cover the rotary inner cylinder 1, and a furnace body 3 made of a steel plate 38 and having the inner part made of fireproof castable is constructed in the exterior of the fixed outer cylinder 2. A combustion chamber 4 made of the steel plate 38 and having the inner part made of the fireproof castable 15 is installed in the side surface thereof. A cooling screw feeder 10 and a rotary valve 14 are attached to a discharging opening 40 of a treated product, opened in the furnace body 3 at the lower surface of a heating tank 45, and an exhaust duct 22 is installed therein to provide the objective vertical carbonizing apparatus with the rotary inner cylinder.