PROBLEM TO BE SOLVED: To improve durability of a quality measuring device without decreasing a storage capacity of a grain tank while reducing rise in temperature of the quality measuring device.SOLUTION: A side edge part located inside a grain tank for storing harvested grains therein is provided with a quality measuring device for measuring a quality of the grain. Among outer peripheral parts of the grain tank, the side wall part on which the quality measuring device is mounted is provided with: an introduction port 96 for introducing air for cooling down the quality measuring device and a discharge port for discharging the air after cooling down the quality measuring device. There are provided, along the side wall part, an air instruction path 98 for continuously communicating the introduction port 96 and the quality measuring device in a storage case 23, and an air discharge path for continuously communicating the discharge port and the quality measuring device.SELECTED DRAWING: Figure 12COPYRIGHT: (C)2018,JPO&INPIT【課題】穀粒タンクの貯留容量を犠牲にすることなく、品質計測装置の温度上昇を抑制することを可能にしながらも、品質計測装置の耐久性の向上を図ることが望まれていた。【解決手段】収穫した穀粒を貯留する穀粒タンクの内部における側端部に、穀粒の品質を計測する品質計測装置が備えられ、穀粒タンクの外周部のうちの品質計測装置が設けられた側の側壁部に、品質計測装置を冷却するための空気を導入する導入口96と、品質計測装置を冷却した後の空気を排出する排出口とが備えられ、導入口96と収納ケース23内の品質計測装置とを連通接続する導入用通気経路98、及び、排出口と品質計測装置とを連通接続する排出用通気経路が、側壁部に沿って設けられている。【選択図】図12
