Abstract Topic Structure being simple, to be inexpensive, base rock fall and the falling rock etcBeing installed in danger area by simple operation, departure of the falling rock and the likeYou watch raw in high accuracy. Solutions In danger area P of base rock fall and falling rock etc installationThe re it is falling rock protection to be connected fence 1 and the like by or the wa being done directly, the bedFacilities the displacement inspection wire 11 which is done and displacement inspection indicator 12With having, it is constituted. The falling rock protection fence the falling rock and the like by occurrenceDisplacement and base rock fall of 1, with the tremor of the pumice stone or earth lumpDisplacement operation of the displacement inspection wire 11 which it occurs displacement inspection indicationDetecting with vessel, 12 you watch the occurrence of the falling rock and the like.
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