A projector apparatus, comprising a light converging unit (14) for converging image light for formation of a predetermined image; a lens unit (4) for passing through the image light from the light converging unit (14) so that an image of a predetermined magnification is displayed on a screen; a moving unit (5) for changing a relative distance between the light converging unit (14) and the lens unit (4) to adjust a position of the image displayed on the screen by the lens unit (4); and a control unit (6) for determining whether or not the relative distance changed by the moving unit exceeds a predetermined amount.