An energy treatment device includes a movable handle including a jaw and a first through hole, an elongated member, and a sheath including a hollow portion and a second through hole, wherein the hollow portion is configured to receive the elongated member. The second through hole is configured to extend so as not to overlap with the hollow portion. The movable handle is configured to rotate about an axis which is configured to pass through the first through hole and the second through hole such that the jaw is rotatable with respect to the sheath, and (D1+D2)/2<；L1 is satisfied, where D1 is a diameter of the hollow portion, D2 is a diameter of the first through hole, and L1 is a distance between a central position of the hollow portion and a central position of the first through hole in an opening/closing direction of the jaw.
