A cuff to be wrapped and attached around a measurement target portion for blood pressure measurement, the cuff including: a bag-shaped exterior portion having a circumferential direction that is a winding direction around the measurement target portion and a width direction that is a direction orthogonal to the circumferential direction, and including an outer surface that is on an outer side and an inner surface that is on an inner side when the cuff is attached; a fluid bag accommodated in the exterior portion; and a surface fastener provided on a surface of the exterior portion, wherein a scale that divides the exterior portion in the circumferential direction is provided on the surface of the exterior portion, and the cuff is configured to be able to specify where a predetermined portion of the cuff is positioned on the scale when the cuff is attached.