PROBLEM TO BE SOLVED: To provide an ankle band and a sleep state measurement system that can be made to follow an ankle sufficiently and can accurately and highly precisely measure a temperature of the ankle.SOLUTION: An ankle band according to an embodiment is an ankle band 1 to be wound around an ankle M1 of a measurement target person M, the ankle band comprising: a base part 2 composed of an expanding and contracting material； an ankle temperature measurement part 11 that is fixed to the base part 2 and measures a temperature of the ankle M1； a body motion measurement part 12 that is fixed to the base part 2 and measures a body motion of the measurement target person M； and a transmission part 14 that transmits the temperature of the ankle M1 measured by the ankle temperature measurement part 11 and the body motion of the measurement target person M measured by the body motion measurement part 12 to the outside of the ankle band 1.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2020,JPO&INPIT【課題】足首に十分に追従させることができると共に、足首の温度を正確且つ高精度に測定することができる足首バンド及び睡眠状態測定システムを提供する。【解決手段】一実施形態に係る足首バンドは、測定対象者Ｍの足首Ｍ１に巻き付けられる足首バンド１であって、伸縮する生地によって構成されたベース部２と、ベース部２に固定されると共に足首Ｍ１の温度を測定する足首温度測定部１１と、ベース部２に固定されて測定対象者Ｍの体動を測定する体動測定部１２と、足首温度測定部１１によって測定された足首Ｍ１の温度、及び体動測定部１２によって測定された測定対象者Ｍの体動を足首バンド１の外部に送信する送信部１４と、を備える。【選択図】図１
