PURPOSE: To miniaturize a projector device by enlarging a projected image in a short distance.

CONSTITUTION: The image from a projecting means 1 is reflected by using a convex mirror 2 and projected on a screen 3. By using the convex mirror 2, the image is largely enlarged in a short distance, so that the projector device is miniaturized. By making the use of the principle that an image is largely enlarged in a short distance by a convex mirror, an accessory obtained by arranging the mirror 2 and the screen 3 in one housing is prepared and attached to the position of the optical path of the projector device, so that a small-sized and easy rear type projector device is obtained. By providing the turnable convex mirror 2 in a front projection type projector device and the screen 3 on the upper surface of the device, the device becomes an ordinary front projection type projector device when the mirror 2 is tilted. When the mirror 2 is raised, the image from the projecting means is reflected by the mirror 2 and projected on the screen 3 on the upper surface of the device, and then the device becomes a small-sized image monitor device.