A cuff pressure controller device (100) is connected to a foregoing cuff (10) via an air supply tube (125). The cuff pressure controller device (100) includes a controller unit (111), a cuff pressure detector unit (113), a driver circuit (119), a piezoelectric pump (101), a check valve (121), and a release valve (122). The cuff pressure detector unit (113) detects the cuff pressure of the cuff (10). The driver circuit (119) drives the piezoelectric pump (101) at a drive frequency of 20 kHz or higher. The controller unit (111) controls the cuff pressure detector unit (113), the driver circuit (119), and the release valve (122) in such a way that the cuff pressure stays within a predetermined range based on detection results of the cuff pressure detector unit (113) and the like.
