PROBLEM TO BE SOLVED: To provide a trocar with an imaging function capable of widely observing a region between a surgical site and a body wall in a state of being attached to the body wall.SOLUTION: There is provided a trocar used attached to a body wall H, which leads a surgical instrument to a body cavity through an insertion hole 25 formed inside. The trocar includes a cylindrical guide tube 22 that penetrates a body wall H and is inserted into the body cavity, and a hand side member 24 formed on a hand side of the guide tube 22, which engages with the surface of the body wall H, and whose diameter is larger than that of the guide tube 22. A lens 48 for converging a light from a subject located in an observation region outside the guide tube 22, and an image pickup device 34 for receiving the light converged by the lens 48 and converting it to an image signal are disposed on a cylindrical wall 31 of the guide tube 22.SELECTED DRAWING: Figure 1【課題】体壁に装着された状態で、術部と体壁との間の領域を、広く観察することが可能な撮像機能付きトロッカーを提供する。【解決手段】体壁Ｈに装着された状態で用いられ、内部に形成された挿通孔２５を通じて手術用器具を体腔内に導くトロッカーである。体壁Ｈを貫通して体腔内に挿入される筒状の案内管２２と、案内管２２の手元側に形成され体壁Ｈの表面に係止する案内管２２よりも大径の手元側部材２４と、を有し、案内管２２の筒壁３１に、案内管２２の外側の観察領域に位置する被写体からの光を集光させるレンズ４８と、レンズ４８により集光された光を受光して画像信号に変換する撮像素子３４が設けられている。【選択図】 図１
