PROBLEM TO BE SOLVED: To provide a concentration measuring device and a concentration measuring method capable of automatically determining an appropriate timing of starting measurement.SOLUTION: A concentration measuring device 1A includes: a probe 20 having a light source 21 for outputting a measurement light and a light detection unit 22 for generating a detection signal according to the intensity of an incident light, which is attached to the head； an operation unit 12 for calculating a numerical value related to hemoglobin concentration in the head that varies due to repeated pressing of the sternum based on the detection signal according to the intensity of the measurement light that has propagated inside the head； and an instruction unit 13 for giving an instruction to start calculation to the operation unit 12. The light detection unit 22 generates the detection signal continuously from before the start of calculation by the operation unit 12. The instruction unit 13 determines the start of calculation based on the detection signal.SELECTED DRAWING: Figure 2【課題】測定開始の適切なタイミングを自動的に判断し得る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１Ａは、測定光を出力する光源２１と、入射光の強度に応じた検出信号を生成する光検出部２２とを有しており頭部に取り付けられるプローブ２０と、頭部の内部を伝搬した測定光の強度に応じた検出信号に基づいて、胸骨圧迫の繰り返しに起因して変動する頭部のヘモグロビン濃度に関連する数値を算出する演算部１２と、演算部１２に算出開始を指示する指示部１３と、を備える。光検出部２２は、演算部１２の算出開始前から継続的に検出信号を生成する。指示部１３は、該検出信号に基づいて算出開始を決定する。【選択図】図２
