A gaze point detection device 1 comprises two stereo cameras 2a, 2b for acquiring a face image of a subject A, light sources 3a, 3b disposed on the outside of apertures 9a, 9b, a control circuit 4, 5, 6, and an image processor 7. The image processor 7 calculates a vector r from a corneal reflection point to a pupil on a plane perpendicular to reference lines of the stereo cameras 2a, 2b, computes an angle ¸ of lines of sight of the subject A with respect to the respective reference lines by using a function f 1 , corrects the function f 1 such that directions of lines of sight are closer to each other, and calculates the line of sight directions to detect a gaze point Q on a display screen.
