An object of the present invention is to measure the blood pressure of a living body in a non-contact and non-invasive manner. An experiment apparatus (1) irradiates a subject (7) with a microwave from a transmitting antenna (23) and receives a reflected wave from the receiving antenna (25). Since the phase of the reflected wave changes due to the slight movement of the body surface due to the pulse, the pulse wave can be detected from the phase difference between the transmitted wave and the reflected wave. Further, the experimental apparatus 1 continuously detects the blood pressure of the subject 7 from the blood pressure sensor 5 attached to the subject 7 while continuously detecting the pulse wave. The pulse wave of the subject 7 was Fourier-transformed to generate a frequency spectrum of the pulse wave, and this was compared with the blood pressure of the subject 7 detected by the blood pressure sensor 5. It was found to show a statistically significant positive correlation with systolic blood pressure. From the above experimental results, a device that detects a subject's pulse wave in a non-contact and non-invasive manner using microwaves and measures the systolic blood pressure by applying the above correlation to the subject's pulse wave has become possible. [Selection diagram] Fig. 1【課題】非接触・非侵襲で生体の血圧を測定する。【解決手段】実験装置１は、送信アンテナ２３からマイクロ波を被験者７に照射し、その反射波を受信アンテナ２５で受信する。脈拍による体表面の微動により反射波の位相が変化するため、送信波と反射波の位相差から脈波を検出することができる。更に、実験装置１は、脈波を連続的に検出しながら、被験者７に装着した血圧センサ５から被験者７の血圧も連続的に検出している。被験者７の脈波をフーリエ変換して脈波の周波数スペクトルを生成し、これを血圧センサ５で検出した被験者７の血圧と比較したところ、脈波の周波数成分のうち、８次高調波が収縮期血圧と統計的に有意な正の相関を示すことを発見した。以上の実験結果から、マイクロ波を用いて非接触・非侵襲で対象者の脈波を検出し、これに上記の相関関係を適用して収縮期血圧を測定する装置が可能となった。【選択図】図１
