The purpose of the present invention is to output a pulse rate that is highly reliable. A pulse rate detection device 1 evaluates the reliability of a detected pulse rate on the basis of the SN ratio of a pulse signal while taking into account disturbance factors. The pulse rate detection device 1 has a pulse rate display criteria 1 and a pulse rate display criteria 2 for displaying the pulse rate, wherein when the SN ratio is equal to or greater than the former, the pulse rate is displayed, and when the SN ratio is equal to or greater than the latter and less than the former, the pulse rate is displayed on the condition that the difference from the immediate past pulse rate is smaller than a predetermined reference. When the SN ratio is less than the pulse rate display criteria 2, the reliability is considered low and the pulse rate is not displayed. Additionally, the pulse rate detection device 1 takes into account a movement disturbance caused by movement of the face of a subject 11 and a light disturbance caused by changes in the light illuminating the face of the subject 11, and when the peak frequency in the frequency domain of the movement disturbance or light disturbance is close to the pulse rate at a value equal to or greater than the predetermined reference, the pulse rate detection device 1 determines that the reliability of the detected pulse rate is low due to these disturbances and does not display the pulse rate.L'objectif de la présente invention est d'obtenir une fréquence du pouls qui soit extrêmement fiable. Un dispositif de détection de fréquence du pouls (1) évalue la fiabilité d'une fréquence du pouls détectée sur la base du rapport SN d'un signal d'impulsion tout en prenant en compte des facteurs de perturbation. Le dispositif de détection de fréquence du pouls (1) présente un critère d'affichage de fréquence du pouls 1 et un critère d'affichage de fréquence du pouls 2 pour afficher la fréquence du pouls, lorsque le rapport SN est égal ou sup
