PROBLEM TO BE SOLVED: To provide a biological information detector capable of accurately detecting biological information even when there is a posterior change when measurement is being performed continuously.SOLUTION: A biological information detector 2 includes: a light emitting element 11 and a luminance control part 12 for irradiating a measurement site of a living body with light a sawtooth wave generation part 13 for cyclically changing the light quantity of the light radiated from the light emitting element 11 a light receiving element 21 and a light receiving/amplifying part 22 for receiving the light radiated from the light emitting element 11 to the measurement site and outputting detection signals a comparator 25 for comparing the signal level of the detection signals with a threshold a sample-and-hold part 27 for acquiring the signal level of the detection signals at the point of time at which the prescribed time elapses after the point of time at which the signal level of the detection signals becomes the threshold or higher in the comparator 25 and an AC component extraction part 28, a variable gain amplifying part 29, an AD converter 30, and an operation part 31 which detect biological information from the signal level acquired in the sample-and-hold part 27.COPYRIGHT: (C)2014,JPO&INPIT【課題】継続的に測定している場合の事後の変化があった場合でも、生体情報を精度よく検出できる生体情報検出器の提供。【解決手段】生体情報検出器2は、生体の測定部位に光を照射する発光素子11および輝度制御部12と、発光素子11から照射される光の光量を周期的に変化させる鋸波発生部13と、発光素子11から測定部位に照射された光を受光して検出信号を出力する受光素子21および受光・増幅部22と、前記検出信号の信号レベルを閾値と比較するコンパレーター25と、コンパレーター25で前記検出信号の信号レベルが前記閾値以上になった時点から所定時間が経過した時点の検出信号の信号レベルを取得するサンプルホールド部27と、サンプルホールド部27で取得した信号レベルから生体情報を検出するAC成分抽出部28、可変利得増幅部29、ADコンバーター30、演算部31とを備える。【選択図】図1
