In order to prevent the manipulator (3) from unintentinal movement, and to reduce load applied to the joints, this madial manimpulator system (1) includes a manipulator (3) provided with an elongated portion (8), a movable portion (9) which has one or more joints (12, 13, 14), and a driving portion (10) which is disposed at a proximal end of the elongated portion and which drives the movable portion； a medical device (6) having a channel (7) that can accommodate at least a portion of the elongated portion and the movable portion； a manipulation input portion (2) that generates an operation instruction for moving the manipulator between a treatment state in which the movable portion protrudes from a distal end of the channel and an accommodated state in which the movable portion is accommodated in the channel in accordance with a manipulation instruction input； and a notifying portion (39) that notifies a situation in which the manipulator is shifting from the treatment state to the accommodated state.
