An endoscopic treatment tool includes: a treatment part which is adapted to conduct treatment of tissue within a body cavity； an operation part which is adapted to operate the treatment part； an operation shaft member which connects the treatment part and the operation part； and a coil sheath part through which the operation shaft member passes so that the operation shaft member is capable of forward or backward movement, in which: the coil sheath part comprises: a first coil sheath around which wire is helically wound； and a second coil sheath that has a lower compressive resistance than the first coil sheath, and that has a higher rotation follow-up capability than the first coil sheath； the first coil sheath and the second coil sheath are disposed so as to coaxially and radially overlap； a first end part and a second end part of the second coil sheath are respectively connected to the treatment part and the operation part so as to be incapable of relative rotation around an axis of the second coil sheath； and at least one of the first end part and the second end part is capable of relative movement in an axial direction with respect to the first coil sheath.
