A cuff includes a fluid bladder, an outer cover that contains the fluid bladder toward one end portion, a surface fastener, and another surface fastener. The outer cover includes, in an area of the outer cover that includes a region in which the other surface fastener is provided, a first wide portion in which the width of the outer cover is greater than a width of an area of the outer cover that includes a region in which the surface fastener is provided. The other surface fastener includes a second wide portion in which the width of the other surface fastener is greater than the width of the surface fastener. The cuff can be fitted to a measurement area with certainty.
