An apparatus for evaluating a vascular endothelial function, the apparatus comprising: a first cuff, to be wound around a first body part of a subject; a second cuff, to be wound around a second body part of the subject; a cuff pressure controller, configured to control a cuff pressure of each of the first and second cuffs, and configured to perform continuous pressure stimulation on the first body part of the subject for a time period by using the first cuff; a cuff pressure detector, configured to detect the cuff pressure of the second cuff from an output of a pressure sensor connected to the second cuff; a pulse wave detector, configured to detect pulse waves from the output of the pressure sensor, a display, and an analyzer, wherein the cuff pressure controller is configured to perform first processing using the second cuff before performing the continuous pressure stimulation using the first cuff, and to perform second processing using the second cuff after performing the continuous pressure stimulation using the first cuff, wherein each of the first processing and the second processing includes a first process in which the cuff pressure of the second cuff is raised from an atmosphere pressure to a pressure that is equal to or higher than a mean blood pressure of the subject, and a subsequent second process in which the cuff pressure of the second cuff is lowered to a pressure that is equal to or lower than a minimal blood pressure, wherein the analyzer is configured to apply statistical processing on changes of first pulse waves while the cuff pressure controller performs the first processing to obtain a first average value of amplitudes at a predetermined number of points in a neighbourhood of a maximum value in amplitudes of the first pulse waves, and to apply statistical processing on changes of second pulse waves while the cuff pressure controller performs the second processing to obtain a second average value of amplitudes at a predetermined number of points in a neighbourhood of a maximum value in amplitudes of the second pulse waves, wherein the analyzer is configured to evaluate the vascular endothelial function by comparing the first average value to the second average value, and wherein the analyzer is configured to calculate a blood pressure value from each of the pulse waves, and the display is configured to display the blood pressure value together with the result of the comparing. a first cuff, to be wound around a first body part of a subject; a second cuff, to be wound around a second body part of the subject; a cuff pressure controller, configured to control a cuff pressure of each of the first and second cuffs, and configured to perform continuous pressure stimulation on the first body part of the subject for a time period by using the first cuff; a cuff pressure detector, configured to detect the cuff pressure of the second cuff from an output of a pressure sensor connected to the second cuff; a pulse wave detector, configured to detect pulse waves from the output of the pressure sensor, a display, and an analyzer, wherein the cuff pressure controller is configured to perform first processing using the second cuff before performing the continuous pressure stimulation using the first cuff, and to perform second processing using the second cuff after performing the continuous pressure stimulation using the first cuff, wherein each of the first processing and the second processing includes a first process in which the cuff pressure of the second cuff is raised from an atmosphere pressure to a pressure that is equal to or higher than a mean blood pressure of the subject, and a subsequent second process in which the cuff pressure of the second cuff is lowered to a pressure that is equal to or lower than a minimal blood pressure, wherein the analyzer is configured to apply statistical processing on changes of first pulse waves while the cuff pressure controller performs the first processing to obtain a first average value of amplitudes at a predetermined number of points in a neighbourhood of a maximum value in amplitudes of the first pulse waves, and to apply statistical processing on changes of second pulse waves while the cuff pressure controller performs the second processing to obtain a second average value of amplitudes at a predetermined number of points in a neighbourhood of a maximum value in amplitudes of the second pulse waves, wherein the analyzer is configured to evaluate the vascular endothelial function by comparing the first average value to the second average value, and wherein the analyzer is configured to calculate a blood pressure value from each of the pulse waves, and the display is configured to display the blood pressure value together with the result of the comparing.