An image verification system includes an imaging device and a first image verification device. The imaging device has an image generating unit which generates image data, and a first verification data generating unit which generates first verification data using the image data and common information. In the first image verification device, a first verification unit verifies whether or not the image data is modified using the image data, the first verification data, and the common information. If it is verified by the first verification unit the image data is not modified, an embedding unit embeds watermark data to detect a modified portion of the image data in order to generate watermarked image data. A second verification data generating unit generates second verification data using the watermarked image data and secret information.