PROBLEM TO BE SOLVED: To provide a component concentration detector which can maintain the accuracy in detection of a component concentration of a liquid and reduce the cost of a device.SOLUTION: The component concentration detector for irradiating a liquid with light to detect a component concentration in the liquid from light absorbance thereof comprises: an irradiation unit which emits light a light receiving unit which receives the light emitted from the irradiation unit a liquid cell unit which is disposed between the irradiation unit and the light receiving unit and allows the liquid to pass therethrough and a condensing unit which condenses the light which has been emitted from the irradiation unit and has passed through the liquid cell unit.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2018,JPO&INPIT【課題】液体の成分濃度検出精度を維持することができ、機器のコストダウンを図ることができる成分濃度検出器を提供する。【解決手段】液体に光を照射してその光吸収度合いから液体中の成分濃度を検出する成分濃度検出器であって、光を照射する照射部と、照射部から照射された光を受光する受光部と、前記照射部と前記受光部との間に配置され、液体が流通する液体セル部と、前記照射部から照射された光が前記液体セル部の液体を通過し、その通過した光を集光させる集光部と、を備える構成とする。【選択図】図2
