To provide a second crop-returning structure for a threshing apparatus ensuring improving separation efficiency or separation accuracy at a separatory section.

This second crop-returning structure for the threshing apparatus comprises the separatory section 3 for subjecting a treated product after threshed to separatory treatment and a second crop-returning mechanism 19 functioning to release and return a second crop after separated by the section 3 from the separation terminal end side of the section 3 to the separation initial end side, and also includes a dust-discharging mechanism 31 functioning to suck dust contained in the second crop released from the second crop-returning mechanism 19 and discharge the dust out of the thresher.