1. An in-vehicle image display device that displays images captured with a plurality of in-vehicle cameras, comprising: an image acquisition unit configured to acquire images captured with the in-vehicle cameras; a vehicle periphery image generation unit configured to generate an image of the peripheral area of the vehicle based on the images acquired with the image acquisition unit; a collision-warned part selection unit configured to select a collision-warned part of the vehicle that has a possibility of hitting a nearby object around the vehicle based on a driving state of the vehicle; an enlarged image generation unit configured to process at least one of the images acquired with the image acquisition unit to generate an enlarged image of a peripheral area of the collision-warned part of the vehicle selected by the collision-warned part selection unit; a composite display image generation unit configured to generate a composite display image composed of the enlarged image generated by the enlarged image generation unit and the image of the peripheral area of the vehicle generated by the vehicle periphery image generation unit, the composite display image being displayed in a form in which positions of the enlarged image and the image of the peripheral area of the vehicle are correlated with each other; and a display unit configured to display the composite display image generated by the composite display image generation unit.