A fluid pressure measuring device comprising: a sensor module; a housing that houses the sensor module and comprises a joint comprising an introduction hole through which a fluid to be measured is introduced; a connector provided to the housing; a terminal provided to the connector; and an elastic electrically conductive member (51, 7) provided in a space between the sensor module and the connector and interposed between the terminal and the sensor module, the sensor module comprising: a ceramic module body comprising: a diaphragm displaceable by a pressure of the fluid to be measured introduced through the introduction hole into the sensor module; and a cylindrical portion integral with a periphery of the diaphragm; a detector comprising a strain gauge provided on a flat surface of the diaphragm opposite to a surface of the diaphragm that is to be in contact with the fluid to be measured, the detector detecting a displacement of the diaphragm; a pad provided on a flat surface of the cylindrical portion radially outwardly adjacent to the flat surface of the diaphragm, the pad being electrically connected to the detector and being connected to the electrically conductive member (51, 7); an electronic component provided on the flat surface of the cylindrical portion and electrically connected with the detector and the pad, the electronic component being provided opposing the pad across the flat surface of the diaphragm; and the flat surface of the diaphragm and the flat surface of the cylindrical portion are in the same plane. a sensor module; a housing that houses the sensor module and comprises a joint comprising an introduction hole through which a fluid to be measured is introduced; a connector provided to the housing; a terminal provided to the connector; and an elastic electrically conductive member (51, 7) provided in a space between the sensor module and the connector and interposed between the terminal and the sensor module, the sensor module comprising: a ceramic module body comprising: a diaphragm displaceable by a pressure of the fluid to be measured introduced through the introduction hole into the sensor module; and a cylindrical portion integral with a periphery of the diaphragm; a detector comprising a strain gauge provided on a flat surface of the diaphragm opposite to a surface of the diaphragm that is to be in contact with the fluid to be measured, the detector detecting a displacement of the diaphragm; a pad provided on a flat surface of the cylindrical portion radially outwardly adjacent to the flat surface of the diaphragm, the pad being electrically connected to the detector and being connected to the electrically conductive member (51, 7); an electronic component provided on the flat surface of the cylindrical portion and electrically connected with the detector and the pad, the electronic component being provided opposing the pad across the flat surface of the diaphragm; and the flat surface of the diaphragm and the flat surface of the cylindrical portion are in the same plane. a diaphragm displaceable by a pressure of the fluid to be measured introduced through the introduction hole into the sensor module; and a cylindrical portion integral with a periphery of the diaphragm; a detector comprising a strain gauge provided on a flat surface of the diaphragm opposite to a surface of the diaphragm that is to be in contact with the fluid to be measured, the detector detecting a displacement of the diaphragm; a pad provided on a flat surface of the cylindrical portion radially outwardly adjacent to the flat surface of the diaphragm, the pad being electrically connected to the detector and being connected to the electrically conductive member (51, 7); an electronic component provided on the flat surface of the cylindrical portion and electrically connected with the detector and the pad, the electronic component being provided opposing the pad across the flat surface of the diaphragm; and the flat surface of the diaphragm and the flat surface of the cylindrical portion are in the same plane.