The endoscope system of the present invention includes: an endoscope that has an image pickup device that picks up an observation image of a test object an image display unit that converts image pickup signals that have been sent from the image pickup device into images and then displays these images a first mounting portion that is provided in an operating section of the endoscope and on which the image display unit is mounted and a second mounting portion that is provided in the operating section of the endoscope and on which the image display unit is mounted in a different position from that of the first mounting portion.
