The degree of awakening decision device (100), the heart beat sensing station (110) the heart beat signal is detected, the heart beat interval calculation section (120) heart beat interval is detected and the spectrum calculation section (130) the spectrum density which corresponds to the fluctuation of heart beat interval is calculated. And, the peak frequency calculation section (140) it calculates the maximum spectrum density which becomes the spectrum density which corresponds to maximum frequency and maximum frequency whether or not the degree of awakening decision section (170) a on the basis of the fluctuation tendency of maximum frequency and maximum spectrum density the subject awakening state it decides.覚醒度判定装置(100)は、心拍検出部(110)が心拍信号を検出し、心拍間隔算出部(120)が心拍間隔を検出してスペクトル算出部(130)が心拍間隔の変動に対応するスペクトル密度を算出する。そして、ピーク周波数算出部(140)が極大周波数および極大周波数に対応するスペクトル密度となる極大スペクトル密度を算出し、覚醒度判定部(170)が極大周波数および極大スペクトル密度の変動傾向を基にして被験者が覚醒状態か否かを判定する。
