PROBLEM TO BE SOLVED: To provide a blood pressure measuring device which can improve the accuracy of a blood pressure measurement result.SOLUTION: A blood pressure measuring device 1 includes: a bag-like cuff 71 wound around an organism and expanding due to supply of fluid to an internal space; a feeder for supplying fluid into the cuff; and a guide part 84 provided on the organism side of the cuff 71, and causing creases crossing a winding direction of the cuff on the organism side of the cuff when the cuff expands to compress the organism.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2019,JPO&INPIT【課題】血圧測定結果の精度を向上できる血圧測定装置を提供する。【解決手段】血圧測定装置1は、生体に巻き付けられる、内部空間に流体が供給されることで膨張する袋状のカフ71と、カフ内に流体を供給する供給装置と、カフ71の生体側に設けられ、カフが膨張して生体を圧迫するときに、カフの生体側にカフの巻き付け方向に対して交差する皺を生じさせる案内部84と、を備える。【選択図】図1