Pulse wave analyzer of and pulse wave of analysis

In a pulse wave analyzer of a local maximum point of a differentiated wave is a fourth order of the pulse wave of one beat obtained (S301), a maximum point (P2-point) of a reflected wave in which the maximum point is a characteristic point of the local maximum points of the differentiation of the fourth order, which exists in a region of an original waveform is determined as a start point of a reflection wave zone, which is a first characteristic point (S303). With 10% of the amplitude of the first characteristic than a threshold value, a time point at which the amplitude reaches the threshold value after the relevant point as an end point of the reflection wave zone determines which is a second characteristic point (S305). The duration of the reflection time of the time between the first characteristic point and the second characteristic point is calculated as an index which is useful in the diagnosis of heart disease.