Abstract: An image-reading apparatus has a digital camera (2) for sequentially taking image of each part of a lateral dentition surface as partial images, a distance sensor (21) for measuring a distance from the digital camera (2) to the lateral dentition surface as an imaging distance, a memory that stores the partial images and the imaging distance when the partial images are taken, an image magnification converter that converts the imaging magnification of the partial images so that the imaging magnification of all of the partial images becomes equal based on the imaging distance, and an image combiner for generating a combined image by combining more than one of the partial images.