Treatment tool insertion tool

Treatment instrument insertion instrument 2 is a treatment instrument insertion instrument for attached to the insertion portion 11 of the endoscope 1 to be inserted into a subject, inserting the treatment tool 41 in the insertion portion 11, the main body portion 50 When an attachment portion 33 for attaching the insertion part 11 of the main body portion 50, can be connected to the treatment instrument insertion port 22 of the endoscope 1, a treatment instrument 41 extending from the body portion 50, the treatment instrument insertion port 22 a guide portion 32 for guiding in the insertion portion 11 via a provided in the main body portion 50, securable to the treatment instrument 41 which is inserted into the main portion 50 by at least partially elastically deformed, treatment and an operation member 54 for operating the reciprocating and about the axis of rotation along the axial direction of the treatment instrument 41 in a fixed state of fixing the tool 41.