A device for shifting the imaging axis of a microscope for inspecting endfaces of a fiber-optic connector having multiple rows of endfaces has a supporting body for receiving a microscope; a first swinging lever mounted on top of the supporting body and rotatable about a first swinging axis perpendicular to the imaging axis of the microscope; a first connecting piece extending from the first swinging lever towards the imaging axis; a second swinging lever pivoted on the first connecting piece and rotatable about a second swinging axis perpendicular to the first swinging axis; and a fitting tip connected to the second swinging lever for interfacing with the fiber-optic connector. Using two sets of biasing means and adjustment drivers, the imaging axis passing through the supporting body and the fitting tip can be shifted in two mutually perpendicular directions to selectively align with any endface of the fiber-optic connector.