PROBLEM TO BE SOLVED: To provide a visual line detection device and a visual line detection method capable of highly accurately detecting a visual line direction of an object person, even when the device is used in an environment in which illuminance change is large.SOLUTION: A visual line detection device comprises: an imaging body (first camera 12 and second camera 22)； a corneal reflection light center detection part 42； a pupil center calculation part 41； an iris center calculation part 36 for calculating an iris center of an object person on the basis of an image acquired by the imaging body； an illuminance detection part 50 for detecting illuminance in the surroundings including at least eyes of the object person； an iris center correction part 43 for correcting a coordinate of the iris center, on the basis of a difference between coordinates of the pupil center and iris center； and a visual line direction calculation part 44 for calculating a visual line direction on the basis of the corneal reflection light center and the pupil center when it is detected that the illuminance is less than the threshold, by the illuminance detection part, and calculating a visual line direction on the basis of the corneal reflection light center and a corrected iris center corrected by the iris center correction part, when it is detected that the illuminance is equal to or more than the threshold.SELECTED DRAWING: Figure 1【課題】照度変化の大きな環境で用いても、対象者の視線方向を精度よく検出することができる視線検出装置および視線検出方法を提供する。【解決手段】撮像体（第１カメラ１２および第２カメラ２２）と、角膜反射光中心検出部４２と、瞳孔中心算出部４１と、撮像体で取得した画像に基づいて対象者の虹彩中心を算出する虹彩中心算出部３６と、少なくとも対象者の目を含む周囲の照度を検出する照度検出部５０と、瞳孔中心と虹彩中心の座標の差に基づいて、虹彩中心の座標を補正する虹彩中心補正部４３と、照度検出部により、照度が閾値未満であると検出されたときは角膜反射光中心と瞳孔中心とに基づいて視線方向を算出し、照度が閾値以上であると検出されたときは、角膜反射光中心と、虹彩中心補正部によって補正された補正後虹彩中心とに基づいて視線方向を算出する視線方向算出部４４とを備える。【選択図】図１
