to provide an easy - to - use pressure gauge calibration apparatus that uses a pressure gauge as a standard device and is not affected by an order of calibration pressure points or pressure holding time . there is provided a pressure gauge calibration apparatus including a pressure gauge serving as a standard device , the pressure gauge being calibrated in advance by a calibration procedure to repeat necessarily restoring a pressure zero state after data acquisition at each calibration pressure point , and adjusting pressure to a subsequent calibration pressure point ; a pressure generation control device ; a shut - off valve ; and a measurement control unit . the apparatus has a function to : enable adjusting pressure of a calibrated device and the pressure gauge serving as the standard device in a different procedure ; conduct measurement while the pressure gauge serving as the standard device and the calibrated device are in the pressure transmission state at each calibration pressure point ; after the measurement , shut off the pressure transmission between the pressure gauge serving as the standard device and the calibrated device and restore the pressure gauge serving as the standard device to a predetermined pressure state .