A vibration detection device (10) is provided with a vibration detection unit (110), a sensor-side leak determination unit (120), a first transmission unit (130), and a second transmission unit (140). The vibration detection unit (110) detects vibration transmitted through piping (30). The sensor-side leak determination unit (120) determines whether or not there is a possibility of a leak in the piping (30) based on a measurement result of the vibration detection unit (110). When the sensor-side leak determination unit (120) determines that there is a possibility of a leak, the first transmission unit (130) transmits provisional leak information to an information processing device (20). The provisional leak information indicates that there is a possibility of a leak in the piping (30). When waveform request information indicating a request for waveform data of the vibration is received from the information processing device (20), the second transmission unit (140) transmits waveform data measured by the vibration detection unit (110) to the information processing device (20).