A cuff includes a band that is wound around a measuring position where blood pressure is measured and an air bag that is provided on a measuring position side of the band and whose length in a length direction is shorter than an outer circumference of the measuring position. A first spacer and a second spacer are respectively provided at the ends in the length direction of the air bag. The band is wound around the measuring position so as to cover the first spacer and the second spacer and detachably fixed by a fixing portion to a surface on an opposite side to the measuring position side.
