To provide a biological information measurement device capable of correctly measuring biological information.SOLUTION: A biological information measurement device comprises: a back surface part having a first convex surface in contact with an organism； a translucent member which is provided on the back surface part, and has a second convex surface positioned at the inside of the first convex surface in a plan view from an organism side and protruding more on the organism side from the first convex surface； and a sensor part comprising a light emission part for emitting light to the organism through the translucent member and a light reception part for receiving reflectance from the organism through the translucent member. The first and second convex surfaces are connected by a first concave surface.SELECTED DRAWING: Figure 5【課題】生体情報を正確に測定できる生体情報測定装置を提供する。【解決手段】生体情報測定装置は、生体に接触する第１凸曲面を有する背面部と、背面部に設けられ、生体側からの平面視において第１凸曲面の内側に位置して第１凸曲面より生体側に突出する第２凸曲面を有する透光性部材と、透光性部材を介して生体に光を出射する発光部及び透光性部材を介して生体から反射光を受光する受光部を有するセンサー部と、を備え、第１凸曲面と第２凸曲面とは、第１凹曲面により接続されている。【選択図】図５
