To provide a combine capable of reducing a weight on a front part of a grain tank, and easily discharging used urea water to an external part from an urea water tank in an exhaust emission control device.SOLUTION: A mud guard cover (55) extending in a cross direction is provided on an upper side of a crawler (2A) of a travel device (2), an exhaust emission control device (20) for purifying exhaust gas of an engine (E) is provided between a thresher (4) and a grain tank (7). An urea water tank (28) of the exhaust emission control device (20) is arranged in a lower space of a right bottom wall (7G) of the grain tank (7), a water supply port (28A) of the urea water tank (28) is arranged in the vicinity of a rear wall (7D) of the grain tank (7) in a machine body cross direction, and a scupper (28B) of the urea water tank (28) is at an upper side on outside of the mud guard cover (55).SELECTED DRAWING: Figure 9
