Connector cap (8) with magnetic body to which the camera unit (11) is connected, and a holding magnet portion (7g) and a holding magnet portion for holding the magnetic body portion (8g) provided on the connector cap (8) with magnetic body Including a rod-like part (7x) connected to (7g), with the magnetic part (8g) held by the holding magnet part (7g), through the inside of the trocar (31) having one end introduced into the body. And a drawer (7) for pulling out from the body.カメラユニット(11)が接続される磁性体付コネクタキャップ(8)と、磁性体付コネクタキャップ(8)に設けられた磁性体部(8g)を保持する保持磁石部(7g)及び保持磁石部(7g)に接続する棒状部(7x)を含み、磁性体部(8g)を、保持磁石部(7g)に保持させた状態で、一端が体内に導入されたトロッカ(31)の内部を通して体内から体外に引き出すための引き出し具(7)とを備える。