To provide a harvesting machine capable of detecting a ground height as low as possible, and having a reaping height sensor with a less risk of being damaged suddenly and included in a reaping part.SOLUTION: A harvesting machine includes a plate-like grounding unit 30 supported around a horizontal shaft core X along the machine body left and right directions in a vertically swinging manner to a bottom 91 of a reaping unit 9, and a reaping height sensor 36 having a detection unit 34 for detecting a current ground height of the reaping unit by detecting an angular position of the grounding unit. A front end 30A of the grounding unit is pivoted to the bottom, and the grounding unit is configured so that a free end side portion 30B at the rear side from the front end in the grounding unit is grounded to a field surface, and thereby ground reaction force is received to swing up and down. A regulating unit 32 is provided over the bottom and the free end side portion, and regulating the grounding unit from being separated out of the bottom by a constant regulation angle or more.SELECTED DRAWING: Figure 5【課題】出来るだけ低い対地高さを検知可能であって、かつ、不意に破損する虞が少ない刈高さセンサが刈取り部に備えられた収穫機を提供する。【解決手段】刈取部９の底部９１に機体左右方向に沿った横軸芯Ｘ回りに上下揺動可能に支持された板状の接地部３０、及び、接地部の角度位置を検出することによって刈取部の現状対地高さを検出する検出部３４を有する刈高さセンサ３６が備えられ、接地部の前端部３０Ａが底部に枢支され、接地部は、接地部における前端部よりも後側の遊端側部分３０Ｂが圃場面に接地することで接地反力を受けて上下揺動するように構成され、底部と遊端側部分とに亘って設けられ、接地部が一定の規制角度以上に底部から離間するのを規制する規制部３２が備えられている。【選択図】図５
