PROBLEM TO BE SOLVED: To improve accuracy in detecting a sight line when an image of a dominant eye is in a bad state.SOLUTION: A sight line detection device 10 stores correlation information that correlate characteristics of the dominant eye with ones of a non-dominant eye. Moreover, the sight line detection device 10 extracts the characteristics of the non-dominant eyes from a facial image in which at least part of face including eyes is photographed. Subsequently, the sight line detection device 10 specifies the characteristics of the dominant eye correlated with the extracted ones of the non-dominant eye from the stored correlation information. Furthermore, the sight line detection device 10 detects the sight line of the facial image using the specified characteristics of the dominant eye.
