HEART FAILURE DIAGNOSIS DEVICE

Provided is a heart failure diagnostic device 10 which uses an indicator generated from a standard deviation of a respiratory frequency of a user P to diagnose heart failure. The heart failure diagnostic device 10 comprises: a flexible piezoelectric sensor sheet 12 outputting a detection signal corresponding to an input vibration; a respiratory signal acquisitor 40 extracting, as a respiratory signal, a signal of a vibration frequency caused by respiration from the detection signal detected by the piezoelectric sensor sheet 12; a power spectrum calculator 44 calculating a power spectrum of a respiratory frequency band from the respiratory signal; and a signal corrector 42 correcting the detection signal such that in the power spectrum, a maximum value of a first-order frequency component of a respiratory waveform is at least 1.5 times a maximum value of a second-order frequency component of the respiratory waveform, thereby obtaining the respiratory signal.