A medical observation apparatus according to the present invention is a microscope unit and a support unit that movably supports the microscope unit, and connects a plurality of arm units and two arm units, and one arm unit is connected to the other. A support portion having a plurality of joint portions for holding the arm portion rotatably around a predetermined shaft portion, and one or a plurality of cables inserted into the support portion. Or it has a cylindrical shape through which a plurality of cables can be inserted, and among the plurality of joint portions, a joint portion that connects two arm portions in which the extending direction of one arm portion and the extending direction of the other arm portion are orthogonal to each other Has a rotating part that can rotate according to the rotational power of the shaft part, and a restricting part that is provided at a position where the central axis is offset from the central axis of the shaft part and can regulate the rotation of the rotating part.本発明に係る医療用観察装置は、顕微鏡部と、顕微鏡部を移動可能に支持する支持部であって、複数のアーム部と、二つのアーム部を連結し、一方のアーム部に対して他方のアーム部を所定の軸部のまわりに回動可能に保持する複数の関節部を有する支持部と、支持部の内部に挿通される１または複数のケーブルと、を備え、軸部は、１または複数のケーブルを挿通可能な筒状をなしており、複数の関節部のうち、一方のアーム部の延伸方向と他方のアーム部の延伸方向とが直交する二つのアーム部を連結する関節部は、軸部の回転動力に応じて回転可能な回転部と、中心軸が軸部の中心軸とオフセットした位置に設けられており、回転部の回転を規制可能な規制部と、を有する。
