A treatment device for an endoscope includes an operating wire having a treatment section at a distal end thereof, a first sheath through which the operating wire is inserted, a second sheath into which the first sheath is inserted, a locking portion provided in the treatment section to advance or retreat, a first stopper that regulates advance movement of the locking portion, a second stopper that regulates retreat movement of the locking portion, and a sheath operating portion that advances or retreats the second sheath between a first positional relationship and a second positional relationship. The first stopper is provided in the first sheath via a connecting portion that extends toward the front side from a distal end of the first sheath, and the second stopper is provided in the second sheath on the rear side of the first stopper in the direction of the axis.
