To provide an intravaginal fixation structure of a sensor for monitoring a childbirth of a livestock which can store a sensor unit in the vagina for a long time and can cope with individual differences of livestock and the like.An intravaginal fixation structure of a sensor for monitoring a childbirth insertable into a vagina of a livestock includes a cylindrical sensor housing portion 1 that houses a sensor and a through hole 21a allowing penetration of a cylindrical sensor housing portion And a plurality of blades 21 having notches 21 d cut out from the outer circumferential side of the blades to the inner circumferential side.(FIG.【課題】センサユニットを腟内に長期貯留させることができ、また、家畜の個体差等に対応することが可能な家畜の分娩監視用センサの腟内固定構造を提供する。【解決手段】家畜の腟内に挿入可能な分娩監視用センサの腟内固定構造は、センサを収容した筒状のセンサ収容部1、及び、筒状のセンサ収容部の貫通を許す貫通孔21aと羽根の外周側から内周側に向けて切り欠く切り欠け部21dを有する複数枚の羽根21を備える。【選択図】図2
