The blood pressure measuring device includes a device main body configured to form a flow path of a fluid and supply the fluid, and a cuff to be wound around a living body, the cuff provided with a bag-shaped connection portion with an opening and a connection plate with a hole communicating with the opening; the connection portion formed of a sheet member; the connection plate having a bending elastic modulus higher than that of the connection portion, bonded to the connection portion and adhered to the device main body; and the cuff configured to be inflated when the fluid is supplied to an internal space of the cuff.