Blood pressure measuring device

A blood pressure measuring device comprising:

• a cuff having an inflatable/deflatable fluid bag;
• a main-unit casing in which an inflation/deflation mechanism inflating/deflating said fluid bag is disposed;
• a flexible connection tube connecting said fluid bag and said inflation/deflation mechanism;
• and
• a winding unit capable of retracting said connection tube that is drawn out from said main-unit casing into said main-unit casing, wherein
• said winding unit includes a case body immovably fixed to said main-unit casing, a reel body rotatably supported by said case body, and an elasticity application portion applying elasticity to said reel body in a direction in which said connection tube is wound,
• said connection tube includes a wound portion wound up by said reel body, a fixed portion that is located at a smaller distance from said inflation/deflation mechanism than said wound portion and that is fixed immovably to said case body, and a freely movable portion that is located between said wound portion and said fixed portion and that freely moves as said reel body rotates,
• said reel body is configured to have, on its inside, a housing that houses said freely movable portion of said connection tube and have its outer peripheral surface on which said wound portion of said connection tube is wound, and
• in order to prevent bending of said freely movable portion of said connection tube, a first free-movement end that is a boundary between said wound portion and said freely movable portion of said connection tube is fixed to said reel body while a second free-movement end that is a boundary between said fixed portion and said freely movable portion of said connection tube is disposed at a position that is eccentric relative to a rotational center (O) of said reel body as seen in a direction of a rotational axis of said reel body,
• wherein a distance between the position that is located on the inner peripheral surface of said housing and that is opposite to said second free-movement end in the direction (D) in which said connection tube at said second free-movement end extends toward said freely movable portion, and the position of said second free-movement end is equal to or larger than a radius (R) of said housing.