An endoscope system includes: an image configuring portion (20) 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 (22) configured to detect luminances of the first and second images and a luminance control portion (23) configured to adjust the luminance of at least one of the first image and the second image so that a luminance difference between adjoining parts of the first image and the second image becomes equal to or smaller than a threshold.
