Patent ID: 7766479

Claim:
A gaze point detecting device for detecting a gaze point in a display image of an object person by projecting a display image displayed by an image displaying means to outside via a window and capturing an eye image of the object person through an imaging means, in response to an illumination light irradiated toward the object person positioned outside of the window, the device comprising: a telecentric lens arranged on an optical path between the window and the imaging means, for limiting the eye image to light parallel to the optical path and entering the light in the imaging means; a telecentric diaphragm arranged at a focal position of the telecentric lens; a lens arranged on an optical path between the image displaying means and the window, for constituting a part of the telecentric lens; and a detecting means for detecting a position of the gaze point of the object person based on the eye image captured by the imaging means, wherein a display surface of the image displaying means is arranged at the focal position of the lens arranged between the image displaying means and the window, and thereby a display image from a predetermined position of the image displaying means is converted to parallel light to be projected to the outside.