PROBLEM TO BE SOLVED: To provide a combine-harvester enabled to perform the supplementing work of a reducer to a reducer tank.SOLUTION: A combine-harvester comprises: an operation part 4 positioned on the front side of a machine body; a prime mover part 8 positioned below the operation part 4; an exhaust gas treating equipment 47 for reducing the nitrogen oxide which is contained in the exhaust gas of an engine 21 mounted in the prime mover part 8; and a reducer tank 71 for reserving a reducer to be fed to the exhaust gas treating equipment 47. The reducer tank 71 is disposed on the front side of machine body in front of the engine 21.SELECTED DRAWING: Figure 1