An endoscope is rotatably held while a robot arm holding the endoscope is draped. The endoscope adapter (80) is connected to an adapter (60) for detachably connecting to the adapter (60), and to an insertion part (52) provided on the base (80a) and having an imaging part (53) at the tip. A holding section 83 for rotatably holding the endoscope 50 including the main body section 51 provided about the rotation axis in a direction in which the insertion section 52 extends, and a base section 80 a rotatably provided through the adapter 60. A driven member 84 is driven to be rotated by the rotation drive unit 212 of the robot arm 21, and a transmission mechanism 88 that transmits the rotation of the driven member 84 to the holding unit 83 holding the endoscope 80. [Selection diagram] FIG.【課題】内視鏡を保持するロボットアームにドレープをかけた状態で内視鏡を回転可能に保持すること。【解決手段】この内視鏡アダプタ８０は、アダプタ６０に取り外し可能に接続するための基部８０ａと、基部８０ａに設けられ、先端に撮像部５３が設けられた挿入部５２と挿入部５２に接続された本体部５１とを含む内視鏡５０を、挿入部５２が延びる方向の回転軸線を中心に回転可能に保持する保持部８３と、基部８０ａに回転可能に設けられ、アダプタ６０を介してロボットアーム２１の回転駆動部２１２によって回転駆動される被駆動部材８４と、内視鏡８０を保持した保持部８３に被駆動部材８４の回転を伝達する伝達機構８８と、を備える。【選択図】図４
