PROBLEM TO BE SOLVED: To provide a combine harvester capable of recognizing the abnormality of detecting means which is difficult to detect with only the information of detecting means for detecting an impact force due to the grain poured by a blade.SOLUTION: A combine harvester comprises: a storage part 4 for storing grains threshed by a thresher a storage amount detection part 4c for detecting that grains are stored up to a predetermined position in the storage part 4 a pouring part 23b for pouring the grains fed from the thresher into the storage part 4 detection means for detecting an impact force by the grains poured into the storage part 4 and calculation means for calculating the grain amount on the basis of the impact force detected by the detection means. It is determined whether or not the ratio of the difference between the grain amount detected by the storage amount detection part 4c and the grain amount calculated by the calculation means, to the grain amount detected by the storage amount detection part 4c is larger than a predetermined value. In the case where it is determined that the ratio of the difference is larger than the predetermined value, the combine harvester is characterized by notifying of the abnormality of the detection means.
