To improve maintenance performances by easily rotating a reaping part to an outer lateral position of the machine body with the rotation shaft center in the vertical direction located on the front side of the machine body as the center.

The reaping part 2 is rotated to a maintenance position Y in the outer lateral part with the rotation shaft center Q in the vertical direction as the center. The reaping part 2 can be moved from a reaping operation position X to the maintenance position Y by human power. A first lower limit stopper means A for regulating the lowering of the reaping part 2 at the reaping operation position X and a second lower limit stopper means B for regulating the lowering of the reaping part 2 by acting when the reaping part 2 is rotated to the maintenance position Y without acting at the reaping operation position X are installed.