An image display apparatus has: a synthesizing device (132) for synthesizing a rear image (111B) captured by a rear imaging device (11B) for imaging a rear area of the vehicle (1) and a first rear side image (111BL, 111BR) captured by a first rear side imaging device (11BL, 11BR) for imaging a first rear side area of the vehicle to generate a synthesized image (111C); and a displaying device (14) for displaying the synthesized image. The synthesizing device varies a proportion of an area of each of the rear image and the first rear side image to the synthesized image on the basis of a first information relating to a first turn indicator configured to operate to inform that the vehicle travels rightward or leftward.