PROBLEM TO BE SOLVED: To accurately measure rotation of an eyeball.SOLUTION: An eyeball measurement system includes: an image acquisition section which acquires a first pupil image obtained by photographing the eye of an object person, and a second pupil image obtained by photographing the eye after having obtained the first pupil image a contour calculating section which subjects each of the first pupil image and the second pupil image to processing of calculating the contour of the pupil an angle calculating section which calculates a rotation angle around a visual line of the eyeball of the object person based on a positional relationship between the contour of the pupil obtained from the first pupil image and the contour of the pupil obtained from the second pupil image.SELECTED DRAWING: Figure 4
