To provide a line-of-sight measuring apparatus capable of measuring a wide range of gaze.SOLUTION: Using two pairs of cameras and light sources for photographing the eyeball of an observer, from the two light source reflection lights reflected on the pupil and the corneal surface of the left and right eyeballs of the observer, the cornea of the left and right eyeballs Means for obtaining a radius of curvature (R), a distance (K) between the corneal curvature center and the center of the pupil, two light source reflection lights are detected in one camera means and light source reflection light is detected in the other camera means If it is not detected, the optical axis is calculated by calculating the corneal curvature center position and the pupil center position based on the detected two light source reflection lights, the preliminarily calculated corneal curvature radius (R) and the distance (K) Means for calculating a gazing point based on the optical axes respectively calculated in the left and right eyeballs.(FIG.【課題】広範囲の視線を計測できる視線計測装置を提供する。【解決手段】観測者の眼球を撮影するための2組のカメラと光源を用いて、観測者の左右の眼球の瞳孔と角膜表面で反射する各2つの光源反射光から、左右の眼球の角膜曲率半径(R)と、角膜曲率中心と瞳孔中心との距離(K)を取得する手段と、一方のカメラ手段には2つの光源反射光が検出され、他方のカメラ手段には光源反射光が検出されない場合には、検出された2つの光源反射光、予め算出した角膜曲率半径(R)および距離(K)に基づいて、角膜曲率中心位置と瞳孔中心位置を算出して光軸を算出する手段と、左右の眼球においてそれぞれ算出された光軸に基づいて注視点を算出する手段を備える。【選択図】図6
