A line-of-sight detector (1) including: a storage unit (121) in which a plurality of eyeball features are registered in a mode of associating each of the plurality of eyeball features with a corneal radius a feature amount calculator (103) configured to calculate a feature amount of an eyeball of a person who is gazing at a first gaze point of the gaze points in accordance with an image captured by the camera (201) that has a prescribed position relationship with the person a feature determination unit (106) configured to determine an eyeball feature of the person in accordance with a feature amount of the eyeball that corresponds to the first gaze point in the plurality of eyeball features registered in the storage unit, and the calculated feature amount of the eyeball of the person and a parameter calculator (108) configured to calculate a calibration parameter for a line of sight of the person in accordance with the feature amounts of the eyeball that are included in the determined eyeball feature.
