BIOLOGICAL INFORMATION MEASURING DEVICE

PROBLEM TO BE SOLVED: To provide a non-invasive biological information measuring device which can measure an extremely weak acoustic signal induced by energy absorption of irradiation light with high precision. SOLUTION: The non-invasive biological information measuring device includes: a light source 8; an irradiation unit 10 to emit light including a specific wavelength component within a range from visible light to an infrared region generated at the light source; and an acoustic signal detection unit 11 which has a piezoelectric element formed of a piezoelectric single crystal including lead titanate, is arranged between a subject and the irradiation unit, and detects the acoustic signal generated by absorption of energy of light by a specific substance present in the subject. The piezoelectric single crystal has light transmission property for a wavelength component within a range from visible light to an infrared region. The light emitted from the irradiation unit irradiates the subject via the acoustic signal detection unit. COPYRIGHT: (C)2011,JPO&INPIT