PROBLEM TO BE SOLVED: To provide a time-series signal analyzing device which can take a more accurate analysis by taking cyclic variation of a heat-sound signal into consideration. SOLUTION: A frequency analyzing means 2 generates a plurality of pieces of phoneme data composed of a pair of a frequency and intensity by taking a frequency analysis of the heart sound signal and a block phoneme generating means 3 generates a block phoneme by using the generated phoneme data. A fundamental cycle calculating means 4, on the other hand, calculates the fundamental cycles of the heart sound signal by taking an autocorrelation analysis of the heart sound signal. A block phoneme classifying means 5 classifies block phonemes which have similar frequencies and differences in start time close to integral multiples of the fundamental cycles into the same group. The classified block phonemes are outputted, group by group, to an output means 9.
