<p>A blood pressure information measurement apparatus instantaneously changes a cuff pressure in a specific section of pressure in order to detect a control target value in an arterial volume constant control (S104). During the period, the blood pressure information measurement apparatus detects an arterial volume signal (S106) and detects an inflection point of the detected arterial volume signal by differentiation or the like (S108). The blood pressure information measurement apparatus determines the detected inflection point of the arterial volume signal as the control target value (S112).</p>
