PROBLEM TO BE SOLVED: To accurately measure glucose concentration while reducing a burden applied to a biological body in a liquid injection device injecting liquid such as insulin.SOLUTION: A concentration measuring instrument comprises: an injection needle injecting liquid a reaction section being disposed to the injection needle and showing a predetermined reaction according to concentration of glucose an irradiation section irradiating light to the reaction section a light reception section receiving light arriving from the reaction section and a detection section detecting the concentration of glucose on the basis of information of the light received.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】インスリン等の液体を注入する液体注入装置において、生体にかかる負荷を小さくしつつ、グルコース濃度を正確に測定する。【解決手段】液体を注入する注入針と、前記注入針に配置され、グルコースの濃度に応じて所定の反応を示す反応部と、前記反応部に光を照射する照射部と、前記反応部から向ってくる光を受光する受光部と、受光した前記光の情報に基づいてグルコースの濃度を検出する検出部と、を備える。【選択図】図1
