PURPOSE: To provide a shock detection method and a device which automatically monitors generation of shock signals of metal loose parts such as a container, piping, etc., at all times and is produced at a low cost.

CONSTITUTION: An envelope of an acceleration signal 1 of time series data formed by A/D-converting the signals of a vibration detector arranged in a container, piping, etc., is detected by an envelope processing part 3 in a microprocessor, and effective value amplitude is detected by an effective value processing part 4 so that shock generation is detected by comparing the envelope waveform and the effective value waveform in a divide operation part.