An endoscope system includes: an image configuring portion configured to configure a first image and a second image based on image pickup signals corresponding to different areas in a same subject a luminance detecting portion configured to detect luminances of the first and second images and a luminance control portion adjusting, for areas obtained by dividing each of the first and second images as units, the luminance of at least one of the images so that a luminance difference between two areas where the first image and the second image adjoin each other becomes equal to or smaller than a threshold.
