PROBLEM TO BE SOLVED: To provide a combine harvester capable of simply supporting a urea water tank 174 and easily enhancing supporting rigidity of the urea water tank 174.SOLUTION: The combine harvester includes a first case 75 for removing particulate substances in an exhaust gas of an engine 14, a second case 229 for removing nitrogen oxide substances in the exhaust gas of the engine 14, and a urea mixing tube 239 for connecting the second case 229 to the first case 75. The combine harvester further includes a grain tank 7 to which reaped grains are carried-in and the urea water tank 174 for supplying the urea water to the urea mixing tube 239. The urea water tank 174 is arranged at an outer side of the bottom of the grain tank 7.SELECTED DRAWING: Figure 8
