An endoscope system includes: an endoscope scope insertion portion having an insertion portion configured to be inserted inside a living organism an extracorporeal device which is disposed outside the living organism a first scope-side signal connecting portion that is provided on the endoscope scope insertion portion and has a first electrode and a cylindrical first extracorporeal-side signal connecting portion that is provided on the extracorporeal device and has a second electrode, the first extracorporeal-side signal connecting portion configured to engage with the first scope-side signal connecting portion. In this endoscope system, when the first scope-side signal connecting portion is engaged with the first extracorporeal-side signal connecting portion, at least a portion of the first scope-side signal connecting portion is located within an inside-cylinder space of the first extracorporeal-side signal connecting portion, and the first electrode and the second electrode are electrostatically coupled together.
