PROBLEM TO BE SOLVED: To provide a mounting behaviour detection system for detecting easily a mounting behaviour.SOLUTION: In a mounting behaviour detection system including a device 10 on a mounting side fitted to a neck of one livestock, for emitting a transmission signal, and a device 20 on a mounted side fitted on some position between a back and a tail of another livestock, the device 20 on the mounted side is fitted to hairs or a skin of the livestock by an adhesive. The transmission signal is a signal based on NFC technical standard, and the device 20 on the mounted side is an RFID tag based on the NFC technical standard.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】乗駕行動を容易に検知する乗駕行動検出システムを提供する。【解決手段】一の家畜の首に取り付けられ、発信信号を発する乗駕側装置10と、他の家畜の背中から尾までいずれかの位置に取り付けられた被乗駕側装置20とを含み、被乗駕側装置20が接着剤により家畜の体毛或いは皮膚に取り付けられる。発信信号は、NFC技術標準に準拠した信号であり、被乗駕側装置20はNFC技術標準に準拠したRFIDタグである。【選択図】図1