PROBLEM TO BE SOLVED: To avoid the possibility that a cutting and transporting unit rushes into a field during harvesting work and the inconvenience that the height of the cutting and transporting unit to the ground becomes higher than a predetermined cutting height. SOLUTION: A harvester has a ground-based first sensor unit 7 and a second sensor unit 8 for detecting the height of a cutting transport unit connected to a front portion of a traveling machine so as to be able to move up and down, and a cutting transport unit 2. The elevating control unit 9B for controlling the elevating and lowering of the sensor unit 7 and the second sensor unit 8 are arranged at different positions in the cutting width direction of the cutting and transporting unit 2, and the elevating control unit 9B is the first. While executing the first cutting height control for maintaining the ground height of the cutting transport unit 2 at a predetermined cutting height based on the detection value from the sensor unit 7, and during the execution of the first cutting height control, When an abnormality in the first sensor unit 7 is detected based on the detected value from the first sensor unit 7 and the detected value from the second sensor unit 8, the first cutting height control is interrupted. [Selection diagram] FIG. 9【課題】収穫作業時に刈取搬送部が圃場に突入する虞や、刈取搬送部の対地高さが所定の刈高さよりも高くなる不都合の発生を回避できるようにする。【解決手段】収穫機は、走行機体の前部に昇降可能に連結された刈取搬送部の対地高さを検出する接地式の第１センサユニット７及び第２センサユニット８と、刈取搬送部２の昇降を制御する昇降制御部９Ｂとを備え、第１センサユニット７と第２センサユニット８とが、刈取搬送部２の刈幅方向において異なる位置に配置され、昇降制御部９Ｂは、第１センサユニット７からの検出値に基づいて刈取搬送部２の対地高さを所定の刈高さに維持する第１刈高さ制御を実行し、かつ、第１刈高さ制御の実行中に、第１センサユニット７からの検出値と第２センサユニット８からの検出値とに基づいて第１センサユニット７の異常を検知した場合に第１刈高さ制御を中断する。【選択図】図９
