The purpose of the present invention is to reduce the amount of data processing caused by individual management of fasteners. This fastener-monitoring device monitors fasteners on a track on which a railroad vehicle travels, the fastener-monitoring device comprising a processing unit that, on the basis of travel data for the railroad vehicle and fastening state data for the fasteners while the railroad vehicle is running, calculates the number of fasteners fastened or dropped per unit length of the track as an index value indicating the fastened state of the fasteners on the track.
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