PROBLEM TO BE SOLVED: To provide a combine-harvester capable of measuring the internal quality of grains by a small-sized internal quality measuring device and to enhance the detection precision by the internal quality measuring device.SOLUTION: A combine-harvester comprises a sampling unit 50 for sampling and temporally holding a portion of grain supplied to a grain tank 10, as the measurement object of an internal quality measuring device 40. Further comprised is an opening/closing plate 54 which can be switched between at an elevated closing position for closing an exhaust port 52a formed in the lower portion of a reception holding portion 52 for holding the sampled grain, and at a lowered opening position for opening the exhaust port 52a. The opening/closing plate 54 is formed into such a shape in the state positioned at the elevated closing position as is bent upward, as viewed in the direction along an opening/closing axis X, and is arranged such that the uppermost end portion 54t of the bent portion is lower than the lowermost end of the detection region of the internal quality measuring device 40.
