PROBLEM TO BE SOLVED: To provide a biological information acquisition device that detects light from an observation object with high accuracy and radiates light with high accuracy.SOLUTION: The biological information acquisition device comprises: a light detection unit for detecting light from an observation object an observation optical system 154 for guiding the light from the observation object to the light detection unit a light-emitting unit for radiating light and an illumination optical system 152 for guiding the light radiated by the light-emitting unit to the observation object. The observation optical system 154 may have a plurality of optical waveguides disposed in array form, at least some of the plurality of optical waveguides may have a tapered shape, and the effective core area at an end on the light detection unit side may be larger than the effective core area at an end on the observation object side.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】観察対象からの光を高精度に検出し、高精度に光照射する生体情報取得装置を提供する。【解決手段】観察対象からの光を検出する光検出部と、観察対象からの光を、光検出部に導く観察光学系154と、光を出射する発光部と、発光部が出射した光を、観察対象に導く照明光学系152とを備える。観察光学系154は、アレイ状に配された複数の光導波路を有してよく、複数の光導波路の少なくとも一部は、テーパ形状を有してよく、光検出部側の端部における有効コア面積が、観察対象側の端部における有効コア面積よりも大きくてよい。【選択図】図1
