PROBLEM TO BE SOLVED: To enable an urea selective catalytic reduction device to remove nitrogen oxide in exhaust gas discharged from a DPF unit.SOLUTION: A combine-harvester comprises: an urea selective catalytic reduction device (70) which is disposed above a DPF unit (40) and removes nitrogen oxide in exhaust gas after passing through the DPF unit (40)； an exhaust gas inlet port of the DPF unit (40) which is connected through a connection pipe (50) to an exhaust manifold (30B) of an engine (9)； an exhaust gas outlet port of the DPF unit (40) which is connected through a connection pipe (73) to an exhaust gas inlet port of the urea selective catalytic reduction device (70)； a tail pipe (61) which is connected to an exhaust gas outlet port of the urea selective catalytic reduction device (70) and discharges the nitrogen oxide -removed exhaust gas to the outside； and a cover (62) of double structure including an inner cover (62A) and an outer cover (62B) which is mounted in an exhaust port of the tail pipe (61).SELECTED DRAWING: Figure 9
