PROBLEM TO BE SOLVED: To provide a heart rate detection method for correctly extracting an acceleration pulse wave signal from a volume pulse wave signal without amplifying only noise components by second order differential processing to obtain the variation amount of a pulse wave signal nor submerging thereby the original pulse wave signal in noise.SOLUTION: The heart rate detection method for detecting the heart rate by intensity of a light transmitting through or reflecting from a living body includes: a first process of converting the transmitted or reflected light into an electric signal, and subjecting the electric signal to a low frequency transmission filtering; a second process of subjecting the signal after passing through the first process to differential processing; a third process of subjecting the signal after passing through the second process to the low frequency transmission filtering; a fourth process of subjecting the signal after passing through the third process to the differential processing; a fifth process of subjecting the signal after passing through the fourth process to the low frequency transmission filtering; and a sixth process of detecting the peak value from the signal after passing through the fifth process, and assuming the interval of the peak value as a heartbeat interval.
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