The purpose of the present invention is to output highly reliable pulse rates. A pulse rate detection device 1 that evaluates the reliability of a detected pulse rate on the basis of an SN ratio for a pulse signal while considering disturbance factors. The pulse rate detection device 1 has a first pulse rate display standard and a second pulse rate display standard for displaying the pulse rate. When the SN ratio is at or above the first pulse rate display standard, the pulse rate detection device 1 displays the pulse rate. When the SN ratio is at or above the second pulse rate display standard but below the first pulse rate display standard, the pulse rate detection device 1 displays the pulse rate on the condition that the difference between the pulse rate and the next most recent pulse rate is smaller than a prescribed standard. When the SN ratio is less than the second pulse rate display standard, the pulse rate is deemed to have low reliability and is not displayed. The pulse rate detection device 1 also considers movement disturbances caused by movement of the face of a subject 11 and light disturbances caused by changes in the light that is shining on the face of the subject 11 and, when the peak frequency in a frequency range for movement disturbances or light disturbances is within a prescribed standard from the pulse rate, deems the detected pulse rate to have low reliability due to disturbances and does not display the pulse rate.La présente invention a pour objet de délivrer des fréquences de pouls hautement fiables. La présente invention réalise à cet effet un dispositif de détection de fréquence de pouls (1) qui évalue la fiabilité d'une fréquence de pouls détecté sur la base d'un rapport SN pour un signal de pouls tout en tenant compte des facteurs de perturbation. Le dispositif de détection de fréquence de pouls (1) dispose d'une première norme d'affichage de fréquence de pouls et d'une deuxième norme d'affichage de fréquence de pouls pour l'affichag
