PROBLEM TO BE SOLVED: To provide a blood component concentration measuring apparatus capable of accurately measuring the concentration of blood components utilizing sweat.SOLUTION: In a measurement/computation unit included in the measuring apparatus, definite time passages are detected after sweating promotion (steps S201, S203). Then, the concentration of a first component in the sweat obtained thereafter is converted into the concentration of the first component in the blood (steps S300, S307).COPYRIGHT: (C)2009,JPO&INPIT【課題】汗を利用して血中成分の濃度を精度よく測定することのできる血中成分濃度測定装置を提供する。【解決手段】測定装置に含まれる測定演算装置では、発汗促進後、所定時間の経過を検出(ステップS201,S203)し、その後に得られた汗中の第1成分の濃度を血中の第1成分の濃度に変換する(ステップS300,S307)。【選択図】図10