PROBLEM TO BE SOLVED: To provide a combine harvester capable of suitably retaining a posture of joined grain culms regardless of an amount of grain culms, preventing clogging of grain culms in a joining part, and improving workability.SOLUTION: A combine harvester includes a reaping part, a thresher, and a grain culm conveyance device. The grain culm conveyance device conveys grain culms reaped by the reaping part to the thresher. The grain culm conveyance device includes a left lower conveyance mechanism 7, a right lower conveyance mechanism 8, a central lower conveyance mechanism, a joining part 9, and a vertical conveyance mechanism. The left lower conveyance mechanism 7, the right lower conveyance mechanism 8 and the central lower conveyance mechanism convey grain culms. In the joining part 9, grain culms conveyed by the left lower conveyance mechanism 7, the right lower conveyance mechanism 8 and the central lower conveyance mechanism are joined and pass. The vertical conveyance mechanism conveys grain culms joined in the joining part 9. The joining part 9 is deformable in accordance with an amount of joined grain culms.SELECTED DRAWING: Figure 4COPYRIGHT: (C)2020,JPO&INPIT【課題】穀稈の量にかかわらず、合流する穀稈の姿勢を好適に維持でき、合流部における穀稈の詰まりを防止し、作業性を向上することができるコンバインを提供する。【解決手段】コンバインは、刈取部と、脱穀装置と、穀稈搬送装置と、を備える。穀稈搬送装置は、刈取部によって刈り取られた穀稈を脱穀装置へ搬送する。穀稈搬送装置は、左下部搬送機構7、右下部搬送機構8及び中央下部搬送機構と、合流部9と、縦搬送機構と、を備える。左下部搬送機構7、右下部搬送機構8及び中央下部搬送機構は、穀稈を搬送する。合流部9には、左下部搬送機構7、右下部搬送機構8及び中央下部搬送機構により搬送された穀稈が合流して通過する。縦搬送機構は、合流部9において合流した穀稈を搬送する。合流部9は、合流する穀稈の量に応じて変形可能である。【選択図】図4