PROBLEM TO BE SOLVED: To provide a measurement device capable of precisely measuring component of liquid as a measure object while preventing increase in size.SOLUTION: The distance between a first side wall (12) and a second side wall (16) constituting a measurement chamber (11) is longer the distance between a lower wall (14) and an upper wall (15). The second side wall (16) has a reflection part (13) that reflects a beam of light incoming into the measurement chamber (11) transmitting the first side wall (12) toward a light receiving section (31) disposed below a measuring container (10).SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】測定対象である液体の成分を正確に測定し、かつ、測定装置の大型化を防止する。【解決手段】測定室(11)を構成する、第1の側壁(12)及び第2の側壁(16)間の距離は、下側の壁(14)及び上側の壁(15)間の距離よりも長く、第2の側壁(16)は、第1の側壁(12)を透過して測定室(11)に光を入射した光を、測定容器(10)の下側に配置された受光部(31)に向けて反射する反射部(13)を有する。【選択図】図1
