PROBLEM TO BE SOLVED: To provide a blood glucose level measuring device capable of accurately measuring a blood glucose level using light, a blood glucose level calculation method, and a blood glucose level calculation program.SOLUTION: A blood glucose level measuring device includes a light source 11 for outputting measuring light L1 input to a living body 50, a light detector 12 for detecting the measuring light L1 propagated inside the living body 50, and generating a detection signal according to the intensity of the measuring light L1, and an operation part for obtaining time deviation between a temporal change in a first parameter on oxygenated hemoglobin concentration and a temporal change in a second parameter on deoxygenated hemoglobin concentration based on the detection signal, and obtaining data on a blood glucose level based on the time deviation.SELECTED DRAWING: Figure 2【課題】光を用いて血糖値を精度良く測定することができる血糖値測定装置、血糖値算出方法及び血糖値算出プログラムを提供する。【解決手段】血糖値測定装置は、生体５０に入力される測定光Ｌ１を出力する光源１１と、生体５０の内部を伝播した測定光Ｌ１を検出し、測定光Ｌ１の強度に応じた検出信号を生成する光検出器１２と、検出信号に基づいて、酸素化ヘモグロビン濃度に関する第１パラメータの時間的変化と、脱酸素化ヘモグロビン濃度に関する第２パラメータの時間的変化との時間ずれを求め、時間ずれに基づいて血糖値に関するデータを求める演算部とを備える。【選択図】図２
