Without performing particular calibration of each subject, gaze direction detecting apparatus can obtain the gaze direction detection result of the high accuracy. (100), from the three-dimensional position of the face of two parts which are located symmetrically, with calculated as the reference position, the three-dimensional position of the center of the face of the subject to be the detection of gaze direction this equipment, from the three-dimensional position of the pupil center of the left and right, the feature calculation unit for calculating a feature position, a three-dimensional position of the center in the lateral direction of the pupil center of the left and right of the subject (160), feature position with respect to the reference position in the lateral direction and a gaze direction feature amount calculation unit configured to calculate a gaze direction feature value for deviation from the (172) line-of-sight vector calculation unit based on the gaze direction feature value to calculate the gaze direction of the examinee and (173) .被検者ごとのキャリブレーションを特に行うことなく、高い精度の視線方向検出結果を得ることができる視線方向検出装置。この装置(100)は、左右対称に位置する2つの顔部品の三次元位置から、視線方向の検出の対象となる被検者の顔の中心の三次元位置を、基準位置として算出するとともに、左右の瞳中心の三次元位置から、被検者の左右の瞳中心の左右方向における中心の三次元位置を、特徴位置として算出する特徴算出部(160)と、左右方向における基準位置に対する特徴位置のずれ量を、視線方向特徴量として算出する視線方向特徴量算出部(172)と、視線方向特徴量に基づいて、被検者の視線方向を算出する視線ベクトル算出部(173)とを有する。
