The invention relates to a combine harvester, capable of linking with a harvesting pretreatment part in freely-swinging and elevating at the lateral direction position of the driving part of the running engine body, capable of avoiding the interference between the harvesting pretreatment part and driving part produced due to the elevation of the harvesting pretreatment part, and capable of diminishing the length of the fore and after direction of the entire combine harvester. In longitudinal machine frame in the top and bottom direction of a pair of right and left running bodies located at the forepart of the driving part, a longitudinal machine frame located at the pretreatment part side at one side having a harvesting pretreatment part is configured to be more adjacent to the backside of the running body than the longitudinal machine frame at the opposite side of the pretreatment part, the longitudinal machine frame at the opposite side of the pretreatment part is located at the opposite side of one side having a harvesting pretreatment part. In the status the harvesting pretreatment part rises from the descend operation position, one part of the harvesting pretreatment part enters in front of the longitudinal machine frame at the pretreatment part side, and is located at the transverse position of the longitudinal machine frame at the opposite side of the pretreatment part.