To provide a mobile agricultural machine capable of easily altering its specifications either into the crawler specifications and the wheel specifications.

A drive shaft 36 protruding to the left and right from a transmission is arranged admitting installation of wheels 44 and crawler traveling devices 2L and 2R to serve as a traveling device, and they are mounted removably on the left and right of the body 1. A mounting tool to the axle 36 is installed on the outside or inside of the wheel 46 of each wheel 44 or a driving sprocket 29 of the crawler traveling devices 2L and 2R.