Abstract: The invention relates to a sphygmomanometer capable of highly accurately judging the maximum blood pressure and minimum blood pressure, which has a cuff 10 which is attached to an appointed portion of a patient and presses the artery by supplying air therein; an optical range sensor 12 which is located opposite said cuff 10 and is able to detect the pulsation displacement of said artery; a digital processing section 14 which is able to judge the maximum and minimum blood pressure of said patient on the basis of photoelectric volumetric pulse wave signals sent out by said optical range sensor 12; and a display section 38 which is able to display the maximum and minimum blood pressure values judged by said digital data processing section 14.

Abstract: The invention relates to a cuff for a sphygmomanometer, which is able to judge the maximum blood pressure and minimum blood pressure at a high accuracy. The cuff 10 comprises a bendably deformable hard curved plate 10a, an outside cloth 10b which surrounds the outer periphery of said curved plate 10a, an inside cloth 10c sewed to the outside cloth 10b so that the same surrounds the inner periphery of said curved plate 10a, an air bag 10d secured inside the inside cloth 10c, and an engaging fastener 10e sewed to the outer periphery of the outside cloth 10b. The air bag 10d is composed of a transparent bag member 10g in which reinforcing fabric 10f is incorporated in a latticed state. Each optical range sensor 12 is composed of a photocoupler 12a fixed at the outside of the bag member 10g and a reflection plate 12b fixed at the inside of the bag member 10g so as to be opposite to the photocoupler 12a.