PROBLEM TO BE SOLVED: To acquire brain waves and to detect biological information (such as pulse) highly precisely.SOLUTION: A biological information detection apparatus includes: an LED 31 for emitting detection light to a living body (finger) a PD (Photodiode) 42 for receiving light scattered from the living body among the detection light beams a brain waves acquisition/processing part for acquiring the biological information on the basis of the detection light received by the PD 42. A shortest distance D3 between a first circular range on the living body in which radius D1 is represented by D1=L×tan(θ1/2) by using the directivity angle θ1 of the LED 31 and a distance L between the LED 31 and the living body and a second circular range on the living body in which radius D2 is represented by D2=L×tan(θ2/2) by using the directivity angle θ2 of the PD 42 and the distance L, satisfies O≤D3≤2(D1+D2).COPYRIGHT: (C)2012,JPO&INPIT【課題】脈波の取得、並びに生体情報(脈拍など)の検出を、高精度に行う。【解決手段】生体(指)に対して検出光を発光するLED31と、検出光のうち、生体から散乱した光を受光するPD42と、PD42で受光した検出光に基づいて、生体情報を取得する脈波取得・処理部と、を備え、LED31の指向角θ1、及びLED31と生体との距離Lを用いて、半径D1がD1=L・tan(θ1/2)として表される生体上の第1円形範囲と、PD42の指向角θ2、及び距離Lを用いて、半径D2がD2=L・tan(θ2/2)として表される生体上の第2円形範囲と、の最短距離D3が、0≦D3≦2(D1+D2)を満たしている。【選択図】図5
