Importance

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Abstract

Pulse wave is detected by a pulse wave sensor pressed against an arterial vessel of living body. Stability of detection of the pulse wave may be insufficient due to not only inappropriate pressing of the pulse wave sensor but also the living body itself. The insufficient stability of detection of pulse wave resulting from the living body itself cannot be solved by altering the manner of pressing of the pulse wave sensor, but it can be solved by, for example, changing the angle of a hand about the wrist and thereby detecting a pulse wave produced from the radial artery running in the wrist. The present invention has made it possible to automatically identify the insufficient stability of detection of pulse wave due to the living body itself. According to the present invention, it is judged whether or not stability of detection of pulse wave is insufficient due to a living body itself, based upon a first pressing force range within which change of amplitudes of pulses of the pulse wave detected as the pressing force applied to the pulse wave sensor is changed, with respect to the pressing force, is smaller than a predetermined value, and a second pressing force within which change of minimum values of the pulses detected as the pressing force is changed, with respect to the pressing force, is smaller than a predetermined value, and an abnormality signal is generated which represents the insufficient stability of detection of pulse wave.

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First Claim