There is provided an input/output-integrated image reading device that is thin and easy to carry, recognizes text and images with high accuracy, and enables instantaneous and real-time comparison of a read image with a conversion result, such as translation. An image reading device (101) is provided with an image data reading unit (202) that reads an original document, a recognition unit (201) that recognizes text or images on the read original document, a conversion unit (201) that converts display information of read text or images, and a displaying unit (204) that displays display information of text or images that have been subjected to the conversion processing. The image data reading unit (202) and the displaying unit (204) are each in a sheet-like shape, and the device is overall in a sheet-like shape.