A sphygmomanometer cuff for a wearable sphygmomanometer includes a cuff body for wrapping around a predetermined portion of a body. The cuff body includes an air bag, a retaining plate, and an air tube. The air bag includes a top layer, a bottom layer, and an intermediate layer disposed between and spacing apart the top layer and the bottom layer. A sealed cavity is defined between the top layer and the bottom layer. The intermediate layer has a rough surface. The retaining plate is attached to an outer surface of the top layer of the air bag. The air tube extends through the retaining plate and connects with the sealed cavity of the air bag.
