An endoscope system includes an endoscope having an insertion part capable of being be inserted into the interior of a living body an extracorporeal device configured to be installed outside the living body, a first extracorporeal signal connection part having a second electrode electrically connected to the extracorporeal device, and a first scope-side signal connection part that has a first electrode electrically connected to the endoscope, is engaged with the first extracorporeal signal connection part, and has a tubular shape. The insertion part includes an observation part capable of observing a distal end side thereof. When engaged with the first scope-side signal connection part, the first extracorporeal signal connection part is at least partially disposed in an inner cylindrical space of the first scope-side signal connection part, and the second electrode and the first electrode are subjected to capacitive coupling.
