[Problem] There is provided a pressure measuring device capable of preventing a pressure of a medium inside a tube from being erroneously measured.[Means for Resolution] There is provided a pressure measuring device 30 installable in a tube 11 for transferring a medium BL so as to measure a pressure of the medium BL inside the tube 11. The pressure measuring device 30 includes a main body portion 31 mountable to the tube 11, an image acquisition unit32 disposed in the main body portion 31 so as to acquire image information on a pressure receiver that is deformed in response to the received pressure of the medium BL inside the tube 11, and a control unit 100 that converts the image information acquired by the image acquisition unit into pressure information about the pressure.
