To provide a technique of efficiently removing residual rice by facilitating switching operations of air supply in such a constitution as to remove residual rice on bottom parts of a mixed rice elevator and a finished rice elevator according to air ejection.SOLUTION: An air nozzle which blows air while directing an air blowing direction to a bottom part of a mixed rice elevator is provided on a lower part of the mixed rice elevator, an air nozzle which blows air while directing an air blowing direction to a bottom part of a finished rice elevator is provided on a lower part of the finished rice elevator a switching means which switches so as to supply air to one side of the air nozzle of the mixed rice elevator side or the air nozzle of the finished rice elevator side and a switching operation means 68 which performs a switching operation...

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