A cuff pressure adjusting device includes: a gas feeding unit which feeds a gas into a cuff by a pressing manipulation performed by a user a cuff pressure detection unit which detects a pressure in the cuff and a display unit which displays the pressure detected by the cuff pressure detection unit. The gas feeding unit includes: an elastic hollow body which is deformed so as to reduce an inner volume with reception of a pressing manipulation and a support member which is disposed adjacently to the elastic hollow body in a direction along which the pressing manipulation is performed.
