Problem to be solved: to easily replace the parts moving in the direction of the surgical instrument side and the driving part side when the surgical instrument is mounted on the driving portion.This adapterA drive transmission member 62 for transmitting a driving force to the driven member 44 of the surgical instrument 40 from the driving member 201 of the driving part 200 is provided.The drive transmission memberA first member 623 fitted to the driven member 44 of the surgical instrument 40The first member 623 is provided so as to be movable relative to the surgical instrument 40 side and the driving section 200 sideThe drive member 200 has a second member 624 fitted to the drive member 201IncludedThe second memberThe drive member 201 of the drive part 200 is fitted into the second memberAndWhen the driven member 44 of the surgical instrument 40 is fitted into the first member 623,By abutting on the driven member 44 of the surgical instrument 40,The projection 624d restricts movement of the second member 624 to the surgical instrument 40 side.Selection diagram【課題】手術器具を駆動部に装着する際に手術器具側及び駆動部側の方向に移動する部品をユーザーにより容易に交換可能にする。【解決手段】このアダプタ６０は、駆動部２００の駆動部材２０１から手術器具４０の被駆動部材４４に駆動力を伝達する駆動伝達部材６２を備え、駆動伝達部材６２は、手術器具４０の被駆動部材４４と嵌合する第１部材６２３と、第１部材６２３に対して手術器具４０側および駆動部２００側に相対移動可能に設けられ、駆動部２００の駆動部材２０１と嵌合する第２部材６２４とを、含み、第２部材６２４は、駆動部２００の駆動部材２０１が第２部材６２４に嵌合し、かつ、手術器具４０の被駆動部材４４が第１部材６２３に嵌合している場合において、手術器具４０の被駆動部材４４に当接することにより、第２部材６２４の手術器具４０側への移動を制限する突起６２４ｄを有する。【選択図】図１１
