PROBLEM TO BE SOLVED: To quickly and reliably detect failure of a storage state detection sensor in order to detect storage in a receipt holding part of grains equal to or larger than a predetermined amount appropriate for quality measurement.SOLUTION: The combine includes: a temporary storage part 530 arranged in a grain passage 53P including an inlet taking a part of grains thereinto and an outlet 73 discharging the grains to a grain tank 16 a storage shutter 76 capable of changing a position between a storage closed position storing the grains in the temporary storage part 530 and a discharge opened position discharging the stored grains a storage amount detector 75 outputting a storage completion signal when the grains in the temporary storage part 530 reach a predetermined amount and a failure determination part 94 determining failure of the storage amount detector 75 based on that the storage amount detector 75 fails to output the storage completion signal even when a storage amount in the temporary storage part 530 exceeds the predetermined amount, the storage amount estimated based on a measurement result of a yield measurement device 35 measuring a yield of grains stored in the grain tank 16.SELECTED DRAWING: Figure 2
