PROBLEM TO BE SOLVED: To reduce occurrence of a trouble such as a waste straw caught by a layer thickness sensor.SOLUTION: A combine 1 includes a layer thickness sensor 38 detecting a layer thickness of processing objects on an oscillation separation body 20. The layer thickness sensor 38 includes: a detection body 39 rotated according to the layer thickness of the processing objects and a potentiometer 41 detecting a rotation position of the detection body 39 connected via a rotation shaft 40. The layer thickness sensor is arranged above the oscillation separation body 20 while covered on upper, front, and right/left sides of the potentiometer 41 by a member including a cover body 48. The cover body 48 includes at least: an upper cover part 48a covering an upper side of the potentiometer 41 and a side cover part 48b extended from one end part of the upper cover part 48a to a lower side of the rotation shaft 40 and covering one sides of the potentiometer 41 and the rotation shaft 40.SELECTED DRAWING: Figure 14
