PROBLEM TO BE SOLVED: To make it possible to reduce interference between an attachment component of an engine or the like and a first case or a second case, and to improve assembly workability and maintenance workability of the first case or the second case.SOLUTION: A combine-harvester equipped with: a reaping machine a thresher an engine 14 for driving the reaping machine and the thresher a first case 61 which removes a particulate substance in exhaust gas of the engine 14 and a second case 62 which removes a nitrogen oxide substance in the exhaust gas of the engine 14. The combine-harvester has a structure equipped with an engine room 92 in which the engine 14 is provided, and is so configured that the first case 61 and the second case 62, which are concurrently connected to each other, are horizontally supported on an upper surface side of the engine room 92.SELECTED DRAWING: Figure 6
