TREATMENT TOOL, ENDOSCOPE DEVICE, ENDOSCOPE SYSTEM

Provided are a treatment tool, an endoscope device, an endoscope system, and a treatment method that allow safe, reliable, and easy performance of lifting of a part to be treated, exposing a part, which is a treatment target, so as to be easily visible by lifting a lesion part, and accordingly another treatment respect to the part to be treated. An endoscope treatment tool 20 includes an insertion part 21 that is insertable into a first treatment tool channel 14 of an endoscope 2 of an endoscope system 1, an operation part 22, and a single operation wire 27 that is pulled through operation of the operation part 22. The insertion part 21 includes a distal end portion 23 that has an openable and closable grip portion 24, a bending portion 25 that is able to be bent, and a connecting portion 26 that connects the bending portion 25 to the operation part 22. The connecting portion 26 is moved forward and backward along a longitudinal axis of the connecting portion 26 and is rotated about the longitudinal axis. As the connecting portion 26 is moved forward and backward or is rotated, the grip portion 24 moves forward and backward or rotates, through the operation of the operation part 22. As the operation wire 27 is pulled, the grip portion 24 is closed, and the bending portion 25 bends in a state where the grip portion 24 is closed.