To provide a blood pressure measurement device which can be made thin.SOLUTION: A blood pressure measurement device 1 comprises: a basal portion 33； a flow path cover 34 fixed to the basal portion 33 and forming a flow path part 15 between the channel part and the basal portion 33； hollow parts 39, 45 which are formed by projecting a part of an outer surface, on the basal portion 33 side, of the flow path cover 34 to the basal portion 33 side, and hollowing a part of an outer surface, on the opposite side, of the flow path cover 34 to the basal portion 33 33 side； nozzles 40, 50 formed on the bottom surface of the hollow parts 39, 45, and communicating with the flow path part 15； and a cuff structure 6 connected to the nozzles 40, 50, and expanding by being supplied with fluid into an internal space of the cuff structure 6.SELECTED DRAWING: Figure 8【課題】薄型化できる血圧測定装置を提供すること。【解決手段】血圧測定装置１は、基部３３と、基部３３に固定されて、基部３３との間に流路部１５を形成する流路カバー３４と、流路カバー３４の基部３３側の外面の一部が基部３３側に突出し、基部３３に対して反対側の外面の一部が基部３３側に窪む窪み部３９，４５と、窪み部３９，４５の底面に形成され、流路部１５に連通するノズル４０，５０と、ノズル４０，５０に接続される、内部空間に流体が供給されることで膨張するカフ構造体６と、を備える。【選択図】 図８
