The treatment tool includes a long shaft member (2), a treatment unit (3) installed at a distal end portion (2a) of the long shaft member (2) and configured to be capable of operating between a first position and a second position, a driving force transmission member (30) connected to the treatment unit (3) and extending along the longitudinal axis (2c) so as to be freely moved with respect to the long shaft member (2), a manipulation unit (6), and a switch unit (20) allowing the treatment unit to be operated between the first position and the second position, and switch a ratio of a movement amount of the driving force transmission (30) member with respect to a manipulation amount of the manipulation unit, in accordance with the manipulation amount of the manipulation unit (6).
