Projecting device

Patent Pending Provided is a projecting device (100) of a rear projection type for enlarging and projecting an image displayed by a display element, on a screen (S). The projection device comprises a projecting optical system including, sequentially from the side of the display element, a first optical system (L1) having a positive power and a second optical system (L2) having a reflecting face of a positive power, and a plane mirror (20) mounted in the projecting device substantially at a right angle with respect to the screen, for reflecting the light emitted from the projecting optical system, toward the screen