PROBLEM TO BE SOLVED: To provide a baroreflex vascular sympathetic nerve activity detecting device capable of simply and non-invasively detecting a baroreflex vascular sympathetic nerve activity which is a sympathetic nerve activity of a blood vessel accompanying a baroreflex function, and a baroreflex blood vessel. A sympathetic nerve activity detection program and a baroreflex vascular sympathetic nerve activity detection method are provided. A baroreflex detecting a baroreflex vascular sympathetic nerve activity, which is a sympathetic nervous activity of a blood vessel associated with a baroreflex function, based on pulse wave data of a living artery and a pulse interval corresponding to the pulse wave data. In the blood vessel sympathetic nerve activity detecting device 1, a correlation coefficient between a pulse interval and pulse wave data in a series in which a pulse interval continuously increases or decreases by n (n is a natural number of 3 or more) is n-th. A series in which the correlation coefficient is larger than any positive threshold up to the first beat and the correlation coefficient is equal to or less than the threshold at the nth beat is detected as a baroreflex vascular sympathetic nerve activity series indicating baroreflex vascular sympathetic nerve activity. VBRSA sequence detection unit 44 for【課題】 簡易的かつ非侵襲的に、圧反射機能に伴う血管の交感神経活動である圧反射性血管交感神経活動を検出することができる圧反射性血管交感神経活動検出装置、圧反射性血管交感神経活動検出プログラムおよび圧反射性血管交感神経活動検出方法を提供する。【解決手段】 生体動脈の脈波データと、脈波データに対応する拍間隔とに基づいて、圧反射機能に伴う血管の交感神経活動である圧反射性血管交感神経活動を検出する圧反射性血管交感神経活動検出装置１であって、拍間隔がｎ（ｎは３以上の自然数）拍連続して増加または減少する系列のうち、拍間隔と脈波データとの相関係数が、第ｎ－１拍目までは任意の正の閾値より大きく、かつ、第ｎ拍目に相関係数が閾値以下となる系列を圧反射性血管交感神経活動を示す圧反射性血管交感神経活動系列として検出するＶＢＲＳＡ系列検出部４４を有する。
