PROBLEM TO BE SOLVED: To provide a combine-harvester capable of preventing the temperature rise of an internal quality measuring device effectively while the internal quality measuring device is provided in front of a grain tank.SOLUTION: A combine-harvester comprises a cooling fan for feeding an engine cooling wind inwardly of a running machine body, and a grain tank 10 provided at the back of an engine. A measurement chamber 70 opened forwardly of a running machine body is disposed in front of the grain tank 10, and an internal quality measuring device 40 for measuring the internal quality of grains is provided in the measurement chamber 70. The internal quality measuring device 40 is equipped with a housing 74 for accommodating a detection unit and a measurement control unit. The housing 74 is equipped with a suction port 76 capable of introducing the control unit cooling wind for cooling the measurement control unit, and a discharge port 77 capable of discharging the control unit cooling wind. The suction port 76 is disposed at a portion close to the transversely outer side of the housing 74.
