A handle includes a first operation input body provided on a handle main body and configured to rotate in first and second directions to operate a first end effector; an interlock body rotatable relative to the first operation input body; an engaging portion provided in the interlock body and configured to be engaged with the handle main body and to restrict rotation of the first operation input body in the second direction when the first operation input body is rotated in the first direction; and a second operation input body configured to rotate to operate a second end effector, and disengage the engaging portion from the handle main body by pressing the interlock body.