PROBLEM TO BE SOLVED: To provide a reaping portion of a combined harvester, which reduces vibrations and noises generated from a cutting device and simplifies the structure of the cutting device.SOLUTION: The reaping portion of the combined harvester includes rotatably and drivably a plurality of disk-shaped cutting blades 231 for cutting the root sides of grain straws and one disk-shaped auxiliary cutting blade 232 which is formed in a smaller diameter than the diameters of the cutting blades 231 and is used for cutting the root sides of grain straws, in the cutting device 23, wherein the plurality of the cutting blades 231 are arranged on an approximately same straight line in the lateral direction, and the auxiliary cutting blade 232 is arranged on the outside of one of the right and left outermost cutting blades 231 among the plurality of the cutting blades 231.COPYRIGHT: (C)2010,JPO&INPIT【課題】切断装置から発生する振動および騒音を低減し、かつ切断装置の構成を簡易なものとする、コンバインの刈取部を提供する。【解決手段】コンバインの刈取部において、切断装置23に、穀稈を株元側で切断する複数の円盤形状の切断刃231と、切断刃231よりも小径に構成され、穀稈を株元側で切断する一つの円盤形状の補助切断刃232とを回転駆動可能に備えて、複数の切断刃231を左右方向に略同一直線上に並べて配置し、補助切断刃232を複数の切断刃231のうち、最外側に位置する左右一方の切断刃231の外側方に配置する。【選択図】図4
