The present invention provides a foreign substance removal opening / closing device for a thresher, which improves the convenience of operation by opening and closing a door for discharging foreign matter such as stool, bean curd, bean pod, and the like occurring during threshing by using a pedal. In order to achieve the above object, the present invention relates to a threshing machine comprising a threshing chamber provided with a threshing drum which receives power from a motor, and a threshing chamber installed in front of the threshing chamber, The present invention relates to a threshing machine including a discharge port for discharging foreign matter such as a bean sprout, a bean sprout, a bean sprout, and the like, comprising: an opening / closing door integrally formed on a shaft provided through the discharge port； and a shaft projected outside the discharge opening, An elastic member which is integrally rotated, an elastic member which pulls the other side end of the operation member to the lower side to maintain the closed state of the opening / closing door, a pedal portion rotatably installed at the lower portion of the main body, And a link bar is provided which is pin-coupled to open and close the discharge port by the opening and closing door according to the rotation of the pedal part do. The pedal section includes a pedal frame rotatably mounted on a lower portion of the main body and having a link bar pin-coupled to a rear end thereof, a pedal operation member pin-coupled to the pedal frame distal end side, And a foldable pedal supported and folded upward. The pedal portion is rotatable on the main body, and is provided to be able to move left and right by a predetermined width, and a latching protrusion is further formed on the rotation path of the pedal portion so as to allow the rear end of the pedal portion to be opened so as to maintain the opened state of the opening and closing door .본 고안은 탈곡시 발생하는 깻대, 콩대, 콩깍지 등의 이물질을 배출하기 위한 개폐구를 페달을 이용하
