PROBLEM TO BE SOLVED: To provide a constituent concentration detection system that can detect the constituent concentration in a liquid to be delivered, and simultaneously detect the albumin concentration in a common liquid delivery circuit.SOLUTION: A constituent concentration detection system comprises: a first constituent concentration detector that is provided in a channel through which a liquid flows and in which the constituent concentration is detected, and irradiates the liquid with light to detect the constituent concentration in the liquid from the degree of its light absorption a retaining part that retains the liquid flowing through the channel and a second constituent concentration detector that irradiates the liquid retained in the retention part with light to detect the constituent concentration in the liquid from the degree of its light absorption.SELECTED DRAWING: Figure 1【課題】送液される液体の成分濃度を検出しつつ、同時に共通の送液回路でアルブミン濃度も検出することができる成分濃度検出システムを提供する。【解決手段】成分濃度を検出される対象となる液体が流れる流路に設けられ、前記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第1の成分濃度検出器と、前記流路を流れる液体を滞留させる滞留部と、前記滞留部で滞留される前記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第2の成分濃度検出器と、を備える構成とする。【選択図】図1
