PROBLEM TO BE SOLVED: To remove noise from a plurality of signals including pulse waves, irrespective of the difference of the wavelength of the projected light.SOLUTION: A first light receiving unit 1312 is disposed at a first distance along a contact surface of a living body from a light emitting unit contacting the living body and projecting light of a predetermined wavelength toward the inside of the living body. The first light receiving unit 1312 presses a first site of the living body by a predetermined pressing force, and receives the light reflected off the inside of the living body through the first site. A second light receiving unit 1322 is disposed at a second distance longer than the first distance along the contact surface of the living body from the light emitting unit contacting the living body and emitting the light of the wavelength toward the inside of the living body. The second light receiving unit 1322 presses a second site different from the first site of the living body by a predetermined pressing force, and receives the light reflected off the inside of the living body through the second site. A measurement unit 111 measures the pulse wave of the living body on the basis of the signals each representing the light received by the first light receiving unit 1312 and the light received by the second light receiving unit 1322, respectively.COPYRIGHT: (C)2015,JPO&INPIT【課題】照射する光の波長の違いによらずに、脈波を含む複数の信号からノイズを除去する。【解決手段】第1受光部1312は、生体に接触してその生体の内部に向けて決められた波長の光を照射する発光部から、その生体の接触面に沿って第1距離だけ離れて配置され、生体の第1部位を決められた圧力で圧迫し、その生体内で反射した光を第1部位から受ける。第2受光部1322は、生体に接触してその生体の内部に向けて波長の光を照射する発光部から、その生体の接触面に沿って第1距離よりも長い第2距離だけ離れて配置され、生体において第1部位と異なる第2部位を決められた圧力で圧迫し、その生体内で反射した光を第2部位から受ける。測定部111は、第1受光部1312が受けた光、および第2受光部1322が受けた光をそれぞれ示す各信号に基づいて、生体の脈波を測定する。【選択図】図7
