The subject of the invention is to provide a combine harvester which can carry out efficient harvesting operation and prevent the blockage of grain straw caused by the load applied to the harvesting device and the threshing device.The end part of the left grass separating part (14L) at the left side of the harvesting device (4) and the end part of the right grass separating part (14R) at the right side of the harvesting device (4) are respectively set to move freely in the left and right directions.Under the condition that the end parts of the left and right grass parts (14L) move towards the direction close to each other so as to reduce the space between them,Introduce 2 rows of grain stalks between the left and right grass parts (14L) andUnder the condition that the ends of the left-hand and the right-hand parts (14L) are moved in the direction of separation from each other so as to enlarge the separation between them,Introduce 4 rows of grain stalks between the left-hand and right-hand grass parts (14R).本發明的課題是提供一種聯合收割機，其能夠進行高效的收割作業，並能夠防止施加於收割裝置及脫穀裝置的負荷所造成的穀物稈的堵塞。位於收割裝置(4)的左側部的左側分草部件(14L)的末端部和位於收割裝置(4)的右側部的右側分草部件(14R)的末端部分別設置成向左右方向移動自如，在使左側分草部件(14L)的末端部和右側分草部件(14R)的末端部向相互接近的方向移動從而縮小了相互的間隔的狀態下，向左側分草部件(14L)和右側分草部件(14R)之間導入2行穀物稈，在使左側分草部件(14L)的末端部和右側分草部件(14R)的末端部向相互分離的方向移動從而擴大了相互的間隔的狀態下，向左側分草部件(14L)和右側分草部件(14R)之間導入4行穀物稈。
