PROBLEM TO BE SOLVED: To provide a light detector not lowering response speed, when performing light detection by using a photoelectric conversion function of a light detection part.SOLUTION: In a light detector constituted so that a light transmission type light detection part 2 is placed on the front side of eyes of a subject 4, for detecting as the whole light detection part 2 correspondingly to light intensity of incident light to be detected by each light detection element 2a of the light detection part 2, a two-dimensional signal reading circuit (19, 16a) transmissible at least by visible light is provided other than the light detection part 2, and each light detection element 2a includes an organic photoconductive film 15 transmissible at least by visible light.SELECTED DRAWING: Figure 1【課題】 光検出部の光電変換機能を用いて光検出を行う場合に、応答速度の低下をきたすことのない光検出装置を提供する。 【解決手段】 被験者４の眼の前側に光透過型の光検出部２が配置されるように構成され、光検出部２の各光検出素子２ａが検出する入射光の光強度に応じて、光検出部２全体としての検出を行う光検出装置であって、光検出部２の他に少なくとも可視光を透過する２次元の信号読出回路（１９、１６ａ）を備えるとともに、各光検出素子２ａが少なくとも可視光を透過する有機光導電膜１５を備えてなる。【選択図】図１
