PROBLEM TO BE SOLVED: To provide a combine capable of facilitating maintenance work in a grain tank, and suppressing risk of leakage of grains in a storage possible state of the grain tank.SOLUTION: A side plate 31 on a grain tank 7 is switched between an open state and a closed state by rotating to a tank body part 32 around a vertical shaft core. A position holding mechanism IH for holding the position of the side plate 31 to the closed state comprises a plurality of engagement parts 63, 69, a plurality of engaged parts 40, 70, and an operation tool 64 for collectively switching and operating the plurality of engaged parts 40, 70. When a specific engagement part 63 is located at the boundary position, the other engagement part 69 is located at the boundary position or a position corresponding to an engagement release state, and when the side plate 31 is moved to the closed state side in a state in which the specific engagement part 63 is closer to the engagement state side than to the boundary position, the specific engagement part 63 comes into contact with the engaged part 40 before the other engagement part 69 comes into contact with the engaged part 70.SELECTED DRAWING: Figure 7COPYRIGHT: (C)2020,JPO&INPIT【課題】穀粒タンクの内部のメンテナンス作業を容易に行えるようにしながら、穀粒タンクが貯留可能な状態のときに穀粒が漏れ出る等のおそれを少なくするコンバインを提供する。【解決手段】穀粒タンク７における側板３１が、タンク本体部３２に対して縦軸芯周りで回動することにより閉状態と開状態とに切り換え可能に設けられ、側板３１を閉状態に位置保持する位置保持機構ＩＨに、複数の係止部６３、６９と複数の被係止部４０，７０とが備えられ、複数の係止部４０，７０を一括して切り換え操作する操作具６４が備えられ、特定の係止部６３が、境界位置にあるとき、他の係止部６９は、境界位置あるいは係止解除状態に対応する位置にあり、特定の係止部６３が境界位置よりも係止状態側に位置している状態で側板３１を閉状態側に移動させると、他の係止部６９と被係止部７０とが接当する前に、特定の係止部６３が被係止部４０に接当する。【選択図】図７
