Pump device

A pump device comprising:

• a drive source;
• a pump body that has a first wall and a housing space housing the drive source inside on one side of the first wall;
• a pump head that has a pump chamber, and a suction port and a discharge port for transfer fluid communicating with the pump chamber, and the pump head being attached to another side of the first wall;
• a bracket that is arranged between the pump head and the first wall;
• a drive member that is driven in the pump chamber by the drive source;
• and
• a nut plate that has an annular shape and is arranged adjacent to the first wall in the housing space of the pump body, wherein
• the nut plate has a plurality of sets of nut holes at different distances from a center and is arranged to be rotatable along the first wall around an axis which passes through the center and intersects with the first wall,
• the first wall has a plurality of hole sections which are arranged at positions corresponding to the plurality of sets of nut holes, part of the plurality of hole sections are elongated hole sections which extend in a circumferential direction of the nut plate, and
• the pump head and the bracket have a plurality of through holes that are arranged at a pitch which conforms to any one set of the plurality of sets of nut holes of the nut plate, and the pump head and the bracket are fixed to the first wall of the pump body by fastening bolts, via the hole sections of the first wall, to the one set of the nut holes of the nut plate conforming to the pitch of the plurality of through holes.