An image display apparatus that is mountable on a vehicle, wherein the image display apparatus is arranged such that, when the image display apparatus is mounted on a vehicle, the image display apparatus displays an image to a driver of the vehicle, the image display apparatus , when mounted on a vehicle, comprising: an image forming unit configured to form an image with light, the image being a two-dimensional image having lateral and vertical axes; an optical system including a curved mirror that reflects the light forming the image toward a bent transmission and reflection member to display the image with its lateral and vertical axes appearing aligned respectively with X and Y direction axes defined to correspond respectively to the right and left directions with reference to a seat of the driver and the up-and-down directions with reference to the seat; and a rotator configured to rotate the curved mirror about a prescribed axis; characterized in that : an intermediate image, which is formed on a to-be-scanned surface and is a projection on an XY plane of the image from the image forming unit , is oriented such that the lateral axis of the to-be-scanned surface forms an angle θ1 with respect to the X direction, and the prescribed axis about which the curved mirror is rotatable forms an angle θ2 with respect to the X direction, and wherein the angle θ1 and the angle θ2 satisfy the condition 0 0 <|θ1|≤|θ2|; wherein the angle θ1 satisfies the condition 5°<θ1<30°; wherein the angle θ2 satisfies the condition 10°<θ2<40°; and wherein the image display apparatus further comprises a processing device configured to apply a connection to the position of the intermediate image to thereby adjust a position of the image in the X direction in response to rotation of the curved mirror about the prescribed axis by the rotator . an image forming unit configured to form an image with light, the image being a two-dimensional image having lateral and vertical axes; an optical system including a curved mirror that reflects the light forming the image toward a bent transmission and reflection member to display the image with its lateral and vertical axes appearing aligned respectively with X and Y direction axes defined to correspond respectively to the right and left directions with reference to a seat of the driver and the up-and-down directions with reference to the seat; and a rotator configured to rotate the curved mirror about a prescribed axis; an intermediate image, which is formed on a to-be-scanned surface and is a projection on an XY plane of the image from the image forming unit , is oriented such that the lateral axis of the to-be-scanned surface forms an angle θ1 with respect to the X direction, and the prescribed axis about which the curved mirror is rotatable forms an angle θ2 with respect to the X direction, and wherein the angle θ1 and the angle θ2 satisfy the condition 0 0 <|θ1|≤|θ2|; wherein the angle θ1 satisfies the condition 5°<θ1<30°; wherein the angle θ2 satisfies the condition 10°<θ2<40°; and wherein the image display apparatus further comprises a processing device configured to apply a connection to the position of the intermediate image to thereby adjust a position of the image in the X direction in response to rotation of the curved mirror about the prescribed axis by the rotator . <EOS>