A treatment tool of an endoscope including: a movable tip end portion that performs a treatment on a living body a flexible first coil sheath into which a wire is spirally wound a flexible second coil sheath into which a wire is spirally wound and which is concentrically fitted onto or into the first coil sheath a flexible operation wire that is formed into an elongated thin shape, a tip end thereof being connected to the movable tip end portion, and the operation wire being movably inserted into the first coil sheath and an operation portion for advancing and retracting the operation wire, in which a tip end of the second coil sheath is fixed to the movable tip end and a base end thereof is fixed to the operation portion.
