Deterioration of accuracy of calibration is suppressed. An eye tracking device (100) includes at least one light source configured to irradiate detection light for eye tracking to at least one eyeball of a subject； at least one imager configured to capture image of the at least one eyeball； a position detecting unit (210) configured to detect a position of a pupil center of the at least one eyeball and a position of a corneal reflex center of the at least one eyeball from the image captured by the imager； a gaze determining unit (220) configured to determine whether the subject is gazing at a target position based on the position of the pupil center and the position of the corneal reflex center detected by the position detecting unit (210)； and a calibration unit (222) configured to perform calibration for the eye tracking based on the image captured by the imager when the gaze determining unit (220) determines that the target position is gazed at by the subject.
