PURPOSE: To provide a rotation inspection machine for an internal gear pump, which can mechanize the inspection of an internal gear pump for its rotating performance, and thereby can enhance the efficiency and reliability of inspection.

CONSTITUTION: The machine includes a disc 5, an outer ring member 6 provided over the disc 5, and an inner ring member 7 which has an outer diameter smaller than the inner diameter of the outer ring member 6 roughly by the outer diameter of an internal gear pump 2, and is provided coaxially with the outer ring member 6. The device also includes a rotating roll 9 acting as a drive means for the outer ring member 6, or a rotating roll 10 acting as a drive means for the inner ring member 7. The device is also equipped with a photoelectric switch 11 acting as a detecting means which makes sure of a position with respect to the inner circumferential surface of the outer ring member 6 of an inner rotor 4. Thus as mentioned above, inspection for the rotating performance of the internal pump 2 is mechanized, and the efficiency and reliability of inspection can thereby be enhanced.