To solve the problems that it is conventionally structured that an opening area of a supply port is made different at an upstream side and a downstream side in a conveyance direction of an air pipe, but the structure has no idea of preventing jamming occurrence due to differences in the grain diameter and shape of grains by differences in harvested crops, and jamming occurs due to differences in harvested crops.SOLUTION: A harvesting machine includes a thresher 3 for threshing grain culms reaped with a reaping device 4, and a grain tank 5 for accumulating grains threshed with the thresher 3. In the harvesting machine, there are provided: a delivery device 12 connected to an air pipe 11 for conveying air in the lower part of a funnel part 10 of the grain tank 5； and a shutter 33 capable of adjusting an opening amount by narrowing a supply port 34 when harvested crops are legume such as soy beans, and widening when they are rice/wheat, in the supply port 34 between an inflow part 25 in which grains enter into a take-in cell 30 of a rotary partition wing 17 in a feeder case 15 of the delivery device 12, and the funnel part 10.SELECTED DRAWING: Figure 4
