Component concentration measurement device, component concentration measurement program, and component concentration measurement method

The invention provides a component concentration measurement device, a component concentration measurement program, and a component concentration measurement method, which can accurately determine the concentration of a component to be measured in a liquid sample. A component concentration measurement device is provided with: an optical measurement unit (2) that measures the spectral spectrum of a liquid sample; an electrochemical measurement unit (3) that electrochemically measures the characteristic value of the liquid sample; and a concentration calculation unit (41) that calculates the concentration of the component to be measured by multivariate analysis using the spectral spectrum and the characteristic value as explanatory variables. 本发明提供成分浓度测定装置、成分浓度测定程序以及成分浓度测定方法，精度良好地求出液体样本的测定对象成分的浓度。成分浓度测定装置包括：光学测量部(2)，测量液体样本的分光光谱；电化学测量部(3)，对液体样本的特性值进行电化学测量；以及浓度计算部(41)，通过将分光光谱以及特性值设为解释变量的多变量分析，来算出测定对象成分的浓度。