An objective of the present invention is to obtain a quantity of grains with high precision. A harvester can comprise: a threshing machine for threshing harvested crops； a grain tank in which grains threshed by the threshing machine are conveyed and temporarily stored； a flow sensor (20) for detecting the flow rate of the grains returned to the grain tank over time during harvesting work； a vibration sensor (19) for detecting vibration transmitted to the flow sensor (20) over time during the harvesting work； and a control unit (73) for calculating the flow rate of the grains based on the vibration value. Another objective of the present invention is to smoothly keep a closing plate opened or closed. A harvester can comprise: a grain tank in which grains threshed by a threshing machine are conveyed and temporarily stored； a temporary storing part (1051) for temporarily storing a part of the conveyed grains and discharging the same to the grain tank； a measuring part (1052) arranged by a lateral side of the temporary storing part (1051) and measuring the quality of the temporarily stored grains； a door (1057) a base end of which is axially supported by a first sidewall in a bottom region of the temporary storing part (1051) and which swings upwards to be displaced in a closed state and downwards to be displaced in an open state； and a leakage preventing hole (1060) provided on a second sidewall facing the first sidewall, wherein the temporary storing part (1051) becomes able to store the grains when a free end of the door (1057) gets close to the leakage preventing hole (1060) in the closed state, and in the open state, the grains temporarily stored firstly in the temporary storing part (1051) fall into the grain tank and are discharged.고정밀도로 곡립의 수량을 구하는 것을 목적으로 한다.수확된 작물을 탈곡하는 탈곡 장치와, 탈곡 장치로 탈곡된 곡립이 반송되어 저류되는 곡립 탱크와, 수확 작업 중에 곡립 탱크로 반송되는 곡립의 유량을 경시적으로 검출하는 유량 센서(20)와, 수확 작업 중에 유량 센서(20)에 전달되는 진동을 경시적으로 검출하는 진동 센서(19)와, 진동의 값에 기초하여 유량을 연산하는 제어부(73)를 구비한다.또한, 원활한 개
