A pulsation detecting device 100 includes a signal processing unit 130 that performs frequency resolution processing on the basis of a pulse wave detection signal from a pulse-wave detecting unit 210 and a body motion detection signal from a body-motion detecting unit 220, a pulsation-information calculating unit 170 that calculates pulsation information on the basis of a result of the frequency resolution processing, and a signal-state determining unit 150 that applies determination processing for a signal state to at least one of the pulse wave detection signal and the body motion detection signal. The signal processing unit 130 performs a different kind of the frequency resolution processing according to a determination result of the signal state by the signal-state determining unit 150.
