A cuff for a blood pressure information measuring device configured to be mounted on a measurement site for measuring blood pressure information has a fluid bag for compressing the measurement site, a flexible curved elastic plate located outside the fluid bag while the fluid bag is wrapped around the measurement site, and annular or arc-shaped to extend along the measurement site, an inflation and deflation mechanism secured to the curved elastic plate and inflating and deflating the fluid bag, and a bag-shaped cover body encapsulating the fluid bag, the inflation and deflation mechanism, and the curved elastic plate.
