A threshing apparatus for sorting threshed objects by oscillation is provided, wherein it is easy and inexpensive to adjust the amount of sorting air sent to the upper face of agrain pan of an oscillatory sorter and switch whether or not to send the sorting air. The threshing apparatus comprises anoscillatory sorter 31 including a grain pan 38 having an upper face forming a conveyance face 38a for conveying the threshed objects backward, a chaff sieve 39 disposed behind the grainpan to sort and leak down the threshed objects, and a grain sieve 42 disposed below the chaff sieve 39, the oscillatory sorterbeing configured so as to sort the threshed objects by oscillation, an air blowing fan for blowing sorting air to the oscillatory sorter 31, and detachable arrangement members 52,54, 56, wherein the adjustment members 52, 54, 56 are attached/detached or switched to adjust the amount of sorting air flowing to the conveyance face 38a or switch whether or notto send the sorting air.
