An endoscope control apparatus of the invention includes: a first connector receiving portion and a second connector receiving portion, to and from which an endoscope is attachable and detachable a connection detection portion for detecting a connecting state of the endoscope in the first connector receiving portion and the second connector receiving portion and outputting a connection detection signal a first patient circuit electrically connected to a post stage of the first connector receiving portion and connected also to a first reference potential point and a second patient circuit electrically connected to a post stage of the second connector receiving portion, and connected also to a second reference potential point different from the first reference potential point.
