PROBLEM TO BE SOLVED: To prevent a jamming of grains input in a grain tank at an upper part of a recess for storing an exhaust gas cleaning device formed on a left wall of the gran tank.SOLUTION: An exhaust gas cleaning device (20) is provided between a thresher (4) and a grain tank (7). At a part on a front side from a grain-lifting cylinder (18) on a left wall (7A) of the grain tank (7), a recess (30) is formed in which only a front side and a left side are opened. Wall bodies that form the recess (30) include: a first wall (32) extending from a left upper part to a right lower part of the left wall (7A) of the grain tank (7)； a second wall (33) extending downwardly from a lower end of the first wall (32)； and a third wall (34) extending left-downwardly from a lower end of the second wall (33). A SCR (22) is provided to the exhaust gas cleaning device (20) for cleaning by reducing the nitrogen oxide substances in the exhaust gas by ammonia generated from an urea water, the SCR (22) being entered into the recess (30).SELECTED DRAWING: Figure 11
