A treatment apparatus includes a grip operation linear portion extending from a grip operation section into a flexible tube section and moved along a longitudinal directions axis by a grip operation, and an actuated member provided to be connected to a grip portion and whose actuated state changes between a first actuated state in which the grip portion is a closed state and a second actuated state in which the grip portion is an open state. The treatment apparatus includes a junction coupling portion coupling between the grip operation linear portion and the actuated member so as to change the actuated state of the actuated member in accordance with movement of the grip operation linear portion along the longitudinal directions axis and to allow the grip operation linear portion and the actuated member to rotate directions about an axis relative to each other.
