PROBLEM TO BE SOLVED: To provide a technique capable of improving the measurement accuracy of a concentration of a blood component. A blood component measuring device 1 comprises a plurality of light emitting elements that irradiate a measurement site of a living body with light having different wavelengths, a light receiving element that receives light that has passed through blood at the measurement site, and a measurement site. A control unit 10 that controls a plurality of light emitting elements so as to irradiate light in order of wavelength having low biopermeability is provided. [Selection diagram] Fig. 1【課題】血液成分の濃度の測定精度を向上し得る技術を提供する。【解決手段】血液成分測定装置１は、生体の測定部位に対して異なる波長の光をそれぞれ照射する複数の発光素子と、測定部位における血液を通過した光を受光する受光素子と、測定部位における生体透過性の低い波長順に光を照射するように複数の発光素子を制御する制御部１０と、を備える。【選択図】図１
