A treatment tool (100) includes a sheath (162), a first grasping member (120), a second grasping member (130) and a swing member (140). The first grasping member (120) protrudes from a distal portion of the sheath (162). The second grasping member (130) is rotatably provided to the sheath (120) so that a first angle, which is an angle formed with the first grasping member, changes. The swing member (140) is provided to the second grasping member (130) so as to swing and so that a second angle, which is an angle formed with the second grasping member, changes. When the second angle is at its maximum, there is a first angle at which the first grasping member (120) and the swing member (140) do not contact each other.
