PROBLEM TO BE SOLVED: To provide a combine-harvester capable of easily avoiding the dust adhesion of an internal component quality measuring device by a simple structure.SOLUTION: A measurement chamber 70 in a state partitioned from a grain storage space 10b of a grain tank 10 is disposed in the grain tank 10 and on the inner side of a side wall 10F. An internal component quality measuring device 40 is provided in the measurement chamber 70.