The invention relates to a forest machine comprising a frame (1) and cargo space (2)； a bogie set (3) supported against the body by means of a swing bogie； a sliding frame (4) forming a longitudinal joint of the body and supporting it； and a force device (5) between the body and the slide body to move the slide body relative to the body in the longitudinal direction thereof； a hinge body (8) connected to the slide body with a transverse horizontal link (6) and provided with an additional pair of wheels (7) and a force device (9) for turning the hinge body in relation to the slide body. According to the invention, between the sliding body (4) and the body (10) of the cargo space (2) extending above this includes a support arrangement (11) for distributing both forces generated by the cargo in the cargo space and forces directed from the terrain towards the machine evenly between the different structural parts. .
