A viewing direction detector includes: an infrared light irradiation unit that uses an infrared light source to irradiate an infrared light; a projection unit that causes the infrared light to be reflected by a windshield or a combiner, and projected in a direction towards an eye of a user; an image acquisition unit that acquires, from an infrared camera for imaging the eye from a direction different to the direction in which the infrared light enters the eye, an infrared camera image having a range including the eye; a recognition unit that recognizes a pupil and a Purkinje image in the infrared camera image acquired by the image acquisition unit; and a viewing direction detection unit that detects the viewing direction of the user from the positional relationship between the pupil and the Purkinje image recognized by the recognition unit.
VIEWING DIRECTION DETECTOR AND VIEWING DIRECTION DETECTION SYSTEM