Provided is a manipulator (1) including: a movable part (3) a drive unit (4) that generates power to be supplied to the movable part (3) an elongated flexible long guide member (2) to which the movable part (3) is attached at one end thereof and the drive unit (4) is attached at the other end thereof an elongated tension transmission member (5) that passes through a lumen in the long guide member (2) and that transmits the power of the drive unit (4) to the movable part (3) by means of a tension a tension adjusting mechanism (6) that adjusts the tension of the tension transmission member (5) and a holding unit to which the drive unit (4) is detachably attached. The tension adjusting mechanism (6) is provided with: a tensioner (14) that is provided in a movable manner in a direction intersecting the longitudinal direction of the tension transmission member (5) and that pulls the tension transmission member (5) and a pressing member that is provided in the holding unit and that moves the tensioner (14) in a state in which the drive unit (4) has been attached to the holding unit.
