A fly waste gathering device (6) includes a fly waste gathering box (31) with a fly waste gathering chamber (37) , an introducing section (34) adapted to introduce air to the fly waste gathering chamber (37) , and a first discharging section (35) and a second discharging section (36) adapted to discharge the air in the fly waste gathering chamber (37); a suction fan (32) connected to the first discharging section (35) and adapted to depressurize the fly waste gathering chamber (37) ; and a filter (39) adapted to catch the fly waste in the air discharged from the first discharging section (35). The second discharging section (36) is connected to a main blower. The fly waste gathering device (6) further includes an open/close means (41) adapted to open/close the second discharging section (36) and a shielding member (40) adapted to narrow an opening area of the introducing section (34) . Most Illustrative Drawing : Fig. 3
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