[Problem] A moving sound source velocity estimation device capable of appropriately estimating the velocity of a moving sound source based on sound whose peak frequency is not clear, a velocity monitoring system, a moving sound source velocity estimation method, and a program for moving source sound velocity estimation Do. [Solution] A frequency analysis unit (101) receives a sound signal according to a sound emitted by a sound source, analyzes the frequency of the sound signal, and generates a spectrogram. The model storage unit (102) stores spectrogram template information indicating a spectrogram corresponding to each of at least a plurality of predetermined moving speeds, which is a spectrogram when the sound source moves. The estimation unit (103) estimates the moving speed of the sound source based on the spectrogram generated by the frequency analysis unit (101) and the plurality of spectrograms indicated by the spectrogram template information stored in the model storage unit (102). .
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