To provide a sensor bolt free from the anxiety of consuming up a battery, usable semi-permanently and reduced in a size.
A strain sensor 11 detects a strain generated in a bolt main body 10 by tightening it to a tightened body, and outputs an electric signal of intensity in response to a level of the strain to a control part 13. The control part 13 determines whether an intensity value of the electric signal is within a set range, and a transceiving part 17 transmits a determination result therein to an outside. The transceiving part 17 generates induced electromotive force when receiving a prescribed frequency of radio wave signal from the outside. An electric power source circuit 15 supplies the induced electromotive force to the control part 13. Electric power required for an operation of the sensor bolt 1 is supplied thereby.
ICHIKAWA SHUNJI
Tatsuya Shioda
Shiro Terasaki
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