The objective of this invention is to provide a harvest height detecting device of a combine harvester being able to prevent the grain from being caught. The harvest height detecting device (100) of a combine harvester comprises a bracket (101), a unit body (110), a potential meter (111), and a grounded body (112). The bracket (101) is fixed on a divider (51) of the combine harvester (1). The unit body (110) is configured on the bracket (101) and freely rotates around a first rotating axis (107). The potential meter (111) is configured to detect the rotating location of the unit body (110) that rotates around the first rotating axis (107). When the grounded body (112) is disposed on the unit body (110) and moved forwardly, the grounded body (112) is to rotate integrally with the unit body (110) via push-press by the ground (G).本發明的目的在於提供一種可抑制穀稈勾掛的聯合收割機的收割高度檢測裝置。聯合收割機的收割高度檢測裝置(100)係具備托架(101)、單元主體(110)、電位計(111)、以及接地體(112)。托架(101)係固定在聯合收割機(1)的分草器(51)上。單元主體(110)係以繞著第一旋轉軸(107)旋轉自如的方式安裝在托架(101)上。電位計(111)係檢測單元主體(110)繞著第一旋轉軸(107)的旋轉位置。接地體(112)係安裝在單元主體(110)上，藉由在前進時被地面(G)推壓而與單元主體(110)一體地旋轉。
