A blood pressure monitor (100) includes a cuff having an air bag, a main-unit casing (110) in which an inflation/deflation mechanism for inflating/deflating the air bag is provided, a flexible air tube (160) connecting the air bag and the inflation/deflation mechanism, and a retractor unit (150) capable of drawing in the air tube (160) that is drawn out from the main-unit casing (110) into an air tube housing provided in the main-unit casing (110). With this structure, the blood pressure monitor can be made superior in housing of the air tube connecting the cuff and the main-unit casing.
