PURPOSE:To enable the preparation of koji by an inexpensive cost of equipment with saved labor and energy, utilizing a koji chamber in a brewing plant effectively, placing a rotary culture floor in the chamber, controlling the temperature and humidity to set conditions by a regulator. CONSTITUTION:A koji substrate after pretreatment is piled on the culture floor N-1, a koji mold is grown, and the substrate is transferred to the rotary culture floor 2 by the conveyor screw N-5. When the koji substrate is sent to the discharge screw 4, the koji substrate not lower than a set height is gradually transferred to the side of the central cylinder 3 by the action of the scraper 5 and the discharge screw 4, and arranged automatically at a set height by the rotation of the culture floor 2 and the rotary action of the discharge screw 4. After the feeding operation is over, the screw 4 is moved upward and stopped there by a lift. Air in the chamber is controlled by the sensor 15' and the air- conditioner 15 and the temperature and humidity are adjusted to set conditions, and the temperature of koji is regulated by the operation of the blower 16 derived by the indication of the temperature adjustor 19 controlled by the sensor 18 inserted in the substrate.
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