PROBLEM TO BE SOLVED: To provide a concentration measuring device and a concentration measuring method capable of non-invasively obtaining vein hemoglobin-related information using light. SOLUTION: The concentration measuring device 1 detects a light incident part for injecting measurement light to a measurement site 51 and the measurement light propagating inside the measurement site 51, and a detection signal corresponding to the intensity of the measurement light. And a calculation unit that obtains hemoglobin-related information based on the detection signal. The calculation unit is a filter for extracting a component derived from respiration among the frequency components included in the detection signal, the hemoglobin-related information, or the numerical values appearing in the calculation process of the hemoglobin-related information, in order to obtain the hemoglobin-related information in the vein of the measurement site. Perform processing. [Selection diagram] Figure 1【課題】静脈のヘモグロビン関連情報を、光を用いて非侵襲的に求めることが可能な濃度測定装置及び濃度測定方法を提供する。【解決手段】濃度測定装置１は、被測定部位５１に測定光を入射する光入射部と、被測定部位５１の内部を伝搬した測定光を検出し、該測定光の強度に応じた検出信号を生成する光検出部と、検出信号に基づいてヘモグロビン関連情報を求める演算部とを備える。演算部は、被測定部位の静脈におけるヘモグロビン関連情報を求めるために、検出信号、ヘモグロビン関連情報若しくはヘモグロビン関連情報の算出過程に現れる数値に含まれる周波数成分のうち呼吸に由来する成分を抽出するフィルタ処理を行う。【選択図】図１
