The artery it detects with the pulsating wave which it is related to the cardiac sound which is transmitted cardiac sound, in at least 1 places of the organism, converts those detection signals to the respective signalling frequency. The arteriosclerosis diagnostic device which peak frequency of each signalling frequency specifies, decides degree of arteriosclerosis on the basis of the difference of peak frequency of cardiac sound and peak frequency of the pulsating wave. When it is the person whom arteriosclerosis is not advancing, because the artery is rich in viscoelasticity, with the person whom arteriosclerosis advanced vis-a-vis difference of peak frequency of cardiac sound and peak frequency of the pulsating wave being large, because difference of both peak frequency is small relatively, it is possible to decide degree of arteriosclerosis by comparing both signalling frequency.心音と、生体の少なくとも1箇所において動脈を伝わる心音に関連した脈波とを検出し、それらの検出信号をそれぞれ周波数信号に変換する。各周波数信号のピーク周波数を特定し、心音のピーク周波数と脈波のピーク周波数との差に基づいて動脈硬化度を判定する動脈硬化診断装置。動脈硬化が進行していない人の場合、動脈が粘弾性に富むので、心音のピーク周波数と脈波のピーク周波数との差が大きいのに対し、動脈硬化が進行した人では、両ピーク周波数の差が相対的に小さいため、両周波数信号を比較することにより、動脈硬化度を判定することができる。
