To provide an endoscope system that electrically connects two endoscopes to one electronic device compactly and inexpensively, the endoscopes, and an adapter.SOLUTION: An endoscope system includes a first endoscope comprising a plug in which a first electrode group is arranged, a second endoscope, an adapter, and an electronic device comprising a connector part. The connector part comprises a first terminal group in contact with the first electrode group, and a second terminal group. The adapter includes a thin plate part interposed between the plug and the connector part when the plug is inserted into the connector part, a second electrode group provided in the thin plate part and in contact with the second terminal group, and a connecting part for electrically connecting the second electrode group and the second endoscope.SELECTED DRAWING: Figure 3【課題】本発明は、小型かつ安価に２つの内視鏡を１つの電子機器に電気的に接続する内視鏡システム、内視鏡およびアダプタを提供する。【解決手段】内視鏡システムは、第１電極群が配設されたプラグを備える第１内視鏡と、第２内視鏡と、アダプタと、コネクタ部を備える電子機器と、を含む内視鏡システムであって、前記コネクタ部は、前記第１電極群と接する第１端子群、および第２端子群を備え、前記アダプタは、前記コネクタ部に前記プラグが挿入された状態において、前記プラグと前記コネクタ部との間に介在する薄板部と、前記薄板部に設けられ、前記第２端子群と接する第２電極群と、前記第２電極群と前記第２内視鏡とを電気的に接続する接続部と、を含む。【選択図】図３
