PROBLEM TO BE SOLVED: To provide a threshing device capable of supplying a sorting wind with stable currents.SOLUTION: The threshing device includes: a sieve case 10 a fan 7 supplying a sorting wind to the sieve case 10 a first wind passage 23 which is formed in the fan 7 and in which a sorting wind to be supplied to a lower part of the sieve case 10 flows a second wind passage 24 which is formed in the fan 7 and in which a sorting wind to be supplied to an upper part of the sieve case 10 flows and a third wind passage 32 which is formed in the sieve case 10 and in which a sorting wind from the second wind passage 24 flows. The second wind passage 24 extends in a carriage start edge side direction and U-turns in a carriage terminal side direction. A front vertical wall is arranged at a foremost edge of the sieve case 10 in a carriage direction, an opening is formed at the front vertical wall, an outlet of the second wind passage 24 faces the opening, and the sorting wind from the second wind passage 24 flows through the opening to the third wind passage 32.SELECTED DRAWING: Figure 2
