IMAGE DISPLAY APPARATUS

A substrate housing portion (100) stores a circuit substrate that outputs an image signal. The optical unit generates and projects an image based on the image signal output from the circuit substrate. The image is projected onto a combiner (400). The optical unit has an optical unit main body (210) that includes a light source and an image display element, and a projection unit (300) that is attached to the optical unit main body (210) and thatdeterminesa projection direction. The projection unit (300) is provided with an intermediate image screen (360) that images an intermediate image and is freely removed from or installed in the optical unit main body (210).