A treatment instrument for an endoscope is provided that is suitable for cutting submucosa in endoscopic submucosal dissection. The treatment instrument for an endoscope includes a treatment portion having cutting means at a tip of an insertion portion that is to be inserted into the body. The main unit of the treatment portion is formed in a sawtooth shape having a peak portion and a valley portion. An electrode plate serving as the cutting means is provided in the valley portion.내시경적 점막하층 박리술에 있어서 점막하층을 절단하는데에 적합한 내시경용 처치구를 제공하는 것으로, 내시경용 처치구는 체내에 삽입되는 삽입부의 선단에 절단 수단을 갖는 처치부를 구비한다. 처치부의 본체는 산부와 곡부를 갖는 톱니형상으로 형성되고, 그 곡부에 절단 수단이 되는 전극판이 형성된다.
