PROBLEM TO BE SOLVED: To provide a combine harvester in which used urea water can be easily discharge to outside from an urea water tank of an exhaust emission control device by reducing a weight of a front part of a grain tank.SOLUTION: An urea water tank (28) is arranged in a lower space of a right bottom wall (7G) in a rear part of a grain tank (7), a first cover (68) is detachably provided on a lower side of a right wall (7B) of the grain tank (7), then, a right side wall and a bottom wall of the urea water tank (28) are covered with the first cover (68), and a lower part of the first cover (68) is inclined in a shape of left-downward slope.SELECTED DRAWING: Figure 9COPYRIGHT: (C)2020,JPO&INPIT【課題】グレンタンクの前部の重量を軽減し、排気浄化装置の尿素水タンクから使用後の尿素水を外部に容易に排水処理することができるコンバインを提供する。【解決手段】尿素水タンク（２８）を、グレンタンク（７）の後部における右底壁（７Ｇ）の下方空間に配置し、グレンタンク（７）の右壁（７Ｂ）の下部側に第１カバー（６８）を着脱可能に設け、尿素水タンク（２８）の右側壁と底壁を第１カバー（６８）で覆い、第１カバー（６８）の下部を左下がりに傾斜させた。【選択図】図９
