An image pickup system includes: a left side image pickup unit (21L) configured to generate a first image； a right side image pickup unit (21R) configured to generate a second image having parallax relative to the first image； an area defining portion (31a) configured to define areas where an optical image of the object is picked up in common in the first image and the second image as a first common area in the first image and a second common area in the second image, respectively； a first photometry portion (38) configured to detect brightness of an image in the first common area； a second photometry portion (39) configured to detect brightness of an image in the second common area； and a controlling portion (31) configured to adjust brightness of the first or second image.
