PROBLEM TO BE SOLVED: To provide a biological state acquisition device and the like that acquires biological signals of a biological body in a non-contact manner and can acquire information related to the biological state without performing complicated processing such as frequency analysis with respect to the biological signals.SOLUTION: Biological state acquisition means 52 transmits an electromagnetic wave to a body surface of a biological body, IQ detects its reflection wave, sequentially acquires an I signal and a Q signal in time series and acquires a state of the biological body on the basis of a locus on an I-Q plane of acquisition signals acquired. The biological state acquisition means 52 for acquiring the state of the biological body comprises: stability calculation means 58 for calculating an index of stability of the locus on the I-Q plane of acquisition signals acquired by IQ signal acquisition means 51 and autonomic nerve state determination means 54D for determining a state of an autonomic nerve on the basis of the index of the stability calculated by the stability calculation means 58. The stability is an inverse of a number of pixels used for the locus and is a value becoming smaller as unstability increases when the I-Q plane is defined as a quantized finite plane constituted of M×M pieces of pixels.COPYRIGHT: (C)2014,JPO&INPIT【課題】非接触で生体の生体信号を取得し、生体信号に対して周波数解析などの複雑な処理をせずに、生体状態に関する情報を取得することのできる生体状態取得装置等を提供する。【解決手段】生体の体表面に電磁波を送信し、その反射波をIQ検波して、I信号とQ信号とを時系列に順次取得し、取得した取得信号のIQ平面上の軌跡に基づいて、生体の状態を取得する。生体の状態を取得する生体状態取得手段52は、IQ信号取得手段51で取得した取得信号のIQ平面上の軌跡の安定度の指標を算出する安定度算出手段58と、安定度算出手段58で算出された安定度の指標に基づいて生体の自律神経の状態を判定する自律神経状態判定手段54Dとを備える。安定度は、IQ平面をM×M個の画素からなる量子化した有限平面としたとき、軌跡に用いられる画素数の逆数であり、不安定であるほど小さくなる値である。【選択図】図37
