To eliminate a problem of a combine harvester reaping device manufactured by forward and downward extending a longitudinal connection pipe from the vertical rotation support point of the reaping device, laterally disposing a slide support case at a lower end of the longitudinal connection pipe, slidably supporting a slide pipe on a slide support case, and laterally slidably mounting a raising device, cutting blades, etc., on the slide pipe, wherein the problem comprises generating a significant weight difference between the right and left sides of the combine harvester to unstabilize the reaping work, when the reaping device is slid on the left side.

A transmission triaxial 63 and a transmission quadruple 64 are laterally spun in a slide support case 27 and a slide pipe 30, respectively. Sliding gears 72 and 74 are slidably fit onto the transmission shafts 63 and 64, respectively, and engaged with each other to transmit a power to the reaping portion. The total sliding quantity of the two sliding gears 72, 74 is approximately coincided with the sliding quantity of the reaping portion. A longitudinal connection pipe 25 is disposed at a place deviated on the left side from the lateral center of the vehicle frame in the travel direction, and the slide support case 27 is extended on the right side from the lower end of the longitudinal connection pipe 25.