Sphygmomanometer

A sphygmomanometer comprises:

• a sensing cuff including, when being worn on a site to be measured, a first sheet extending in a circumferential direction of the site to be measured to cross an artery passing portion of the site to be measured, and a second sheet facing the first sheet, the sensing cuff having a bag shape formed by welding the first sheet and the second sheet;
• and
• a back plate disposed on the second sheet, extending along the circumferential direction of the site to be measured, and conveying a pressing force to the sensing cuff,
• wherein a width direction dimension of the back plate measured in a width direction perpendicular to the circumferential direction of the site to be measured, is shorter than a width direction dimension of the sensing cuff, and is further shorter than an inner dimension between welding pools formed at end portions of an internal space of the sensing cuff.