PROBLEM TO BE SOLVED: To provide a biological information detection device capable of non-contactly detecting information about a living body including a heart rate of a living body. A biological information detection device 1 transmits a transmitted wave of a frequency-modulated continuous wave to an object, and detects distance spectrum intensity data based on a frequency difference between the transmitted wave and a reflected wave from the object. The first difference data is calculated, in which the difference between the current distance spectrum intensity data and the previous distance spectrum intensity data is obtained for each distance based on the detection results of the detection system 2 and the detection system 2. The difference data calculation unit 30 is provided, and a first extraction unit 37 for extracting a frequency component corresponding to the heart rate of the living body from the first difference data. [Selection diagram] Fig. 2【課題】生体の心拍数を含む生体に関する情報を非接触で検出することができる生体情報検出装置を提供する。【解決手段】生体情報検出装置１は、周波数変調した連続波による送信波を対象物に送信し、送信波と対象物からの反射波との周波数差に基づいて、距離スペクトル強度データを検出する検出系２と、検出系２の検出結果に基づいて、現在の距離スペクトル強度データとその１つ前の距離スペクトル強度データとの差を距離毎に求めた第１の差分データを算出する第１の差分データ算出部３０と、第１の差分データから生体の心拍数に対応する周波数成分を抽出する第１の抽出部３７とを備える。【選択図】図２
