An object is to provide a sensor node and a vibration monitoring system which can transfer abnormal data immediately after an abnormality occurrence with a low possibility of missing the abnormal vibration at the time of occurrence of the abnormality. The sensor node 10 includes an acceleration sensor 11 for measuring the vibration characteristic of the monitoring target object 70, a memory 17, a sensor node wireless communication unit 19, and a sensor node control unit 15. The control unit 15 notifies the command center 20 of a detection signal indicating that abnormal vibration has been detected immediately after the acceleration sensor 11 detects abnormal vibration, to the command center 20 via the sensor node wireless communication unit 19, and then the acceleration sensor 11 The vibration characteristic of the monitoring target 70 is newly measured, and the measured acceleration data is stored in the memory 17 as storage data, and the storage data is requested by the storage data transfer request from the command center 20. To the command center 20. [Selected figure] Figure 1
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