The tunnel cave-in monitoring system and the engineering works structure damage monitoring system, network 3, plural conductive application patterns 4, plural sensor net terminals 5, the plural staging terminal bureau terminals 7 which are installed in existing facility 6, are formed from route base station terminal 8 and remote monitor 9. Conductive application pattern 4 is applied by the inner wall surface 2, is impressed specified voltage by sensor net terminal 5. With that, inside conductive application pattern 4 electric current flows. That time, cracking occurs in portion of the inner wall surface 2, when the conductive application pattern 4 which was applied part is cut off at least, value of resistance becoming high, current value becomes low. That current value data is measured by sensor net terminal 5, staging terminal bureau terminal 7, route base station terminal through 8 and network 3 from sensor net terminal 5, is transmitted to remote monitor 9. And, remote monitor 9 presumes the occurrence place of cracking from that current value data, indicates.
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