Combine harvester and working machine

The combine harvester is provided with a mounting part (18) on a rear wall part (11) of a threshing device (4), the mounting part (18) can be used for replacing a dust discharge cover (23) and a chopping device, the dust discharge cover (23) covers a dust discharge port (16) so as to guide chips discharged from the dust discharge port (16) to the lower ground, and the chopping device is used for chopping the chips discharged from the dust discharge port (16). The device is configured to be able to select a first state in which a stay (22) for supporting the dust discharge cover (23) is mounted on the mounting member (18) and the dust discharge cover (23) is connected to the rear wall portion (11), and a second state in which the chopping device is mounted on the mounting member (18) and the chopping device is connected to the rear wall portion (11). 有关本发明的联合收割机在脱谷装置（4）的后壁部（11）设置有能够将排尘罩（23）和切碎装置换装的安装部件（18），所述排尘罩（23）将排尘口（16）覆盖以将从排尘口（16）出来的碎屑向下方的地面引导，所述切碎装置将从排尘口（16）出来的碎屑切碎处理。构成为，能够选择为将用来支承排尘罩（23）的撑条（22）安装于安装部件（1