An eyeball information estimation device includes: an acquisition unit acquiring an image including a pupil of a subject and a Purkinje image of the subject; a detection unit detecting a center position of the pupil and a position of the Purkinje image; a selection unit selecting which of first and second sight line angle calculation processings of calculating a sight line angle of the eye of the subject is to be executed; and a processing unit estimating an eyeball center position of the subject based on a three-dimensional face model and updating an eyeball center position of a storage unit, at least on a condition that a pupil reliability is higher than a first pupil threshold value, and a Purkinje reliability is higher than a first Purkinje threshold value, when the first sight line angle calculation processing is selected.