In the medical system of the present invention, the overtube (80) includes a cylindrical main body (81) through which a medical device can be inserted, and the overtube (80) connected to the main body (81) is connected to the console (21). A proximal end portion for connecting to the two connection portions (36), and the proximal end portion of the overtube (80) has a tubular shape having an insertion port into which the treatment instrument insertion portion (50) of the medical device can be inserted. A tubular portion (85) with respect to the second connection portion (36), a base portion (89) for connecting the portion (85), a base end portion of the overtube (80) and the second connection portion (36). And a movable mechanism connected to the base portion (89) so that the tubular portion (85) can operate relative to the second connection portion (36) so as to have two or more degrees of freedom.本発明の医療システムにおいて、オーバーチューブ（８０）は、医療デバイスを挿通可能な筒状の本体部（８１）と、本体部（８１）に接続されオーバーチューブ（８０）をコンソール（２１）の第二接続部（３６）に接続するための基端部と、を備え、オーバーチューブ（８０）の基端部は、前記医療デバイスの処置具挿入部（５０）を挿入可能な挿入口を有する管状部（８５）と、オーバーチューブ（８０）の基端部と第二接続部（３６）とを接続するベース部（８９）と、第二接続部（３６）に対して管状部（８５）が２自由度以上の自由度を有するように管状部（８５）を第二接続部（３６）に対して動作可能とするようにベース部（８９）に接続された可動機構とを有する。
