PROBLEM TO BE SOLVED: To suppress a product cost, eliminate complexity in using algorithm or the like for selecting any one signal of I/Q signals, and stably measure a heart rate and a respiration rate.SOLUTION: A cardiopulmonary function measuring apparatus: converts A/D of I/Q signals output from a Doppler sensor 1； in a case of heartbeat measurement, causes the signals after the A/D conversion to pass through first filters 5a and 5b composed of BPFs for passing a frequency range of the heartbeat (in a case of respiration measurement, causing the signals to pass LPF or BPF with the frequency range of respiration defined as a pass band)； inputs the I/Q signals in a heartbeat measuring part 6； performs FFT operation, for example, with the I signal defined as real part data and the Q signal defined as imaginary part data to calculate vibration amplitude； and calculates a heart rate (a respiration rate in a respiration measuring part) from the frequency of a peak value of the vibration amplitude.SELECTED DRAWING: Figure 1【課題】製品コストを抑えることができると共に、Ｉ，Ｑのいずれか一方の信号を選択するアルゴリズム等を使用する煩雑さをなくし、安定的に心拍数や呼吸数を測定できるようにする。【解決手段】ドップラーセンサ１から出力されたＩ，Ｑ信号をＡ／Ｄ変換し、このＡ／Ｄ変換後の信号を心拍測定の場合は心拍の周波数範囲を通すＢＰＦからなる第１のフィルタ５ａ，５ｂ（呼吸測定の場合は呼吸の周波数範囲を通過帯域とするＬＰＦ又はＢＰＦ）を通し、このＩ，Ｑ信号を心拍測定部６に入力し、例えばＩ信号を実部データ、Ｑ信号を虚部データとしてＦＦＴ変換演算を行うことで振幅を計算し、この振幅のピーク値の周波数から心拍数（呼吸測定部では呼吸数）を求める。【選択図】図１
