A portable radiation image converting device has: an image data generating unit that is sensitive to radiation, and that generates image data expressing a radiation image manifested by radiation that is transmitted through a subject and is irradiated onto an image-receiving surface; a storage unit storing image data generated by the image data generating unit; and one or more projecting units projecting, to a device exterior, various types of information including a radiation image expressed by image data that is stored in the storage unit. Various types of information including a radiation image that is generated by radiation, that has been transmitted through a subject and irradiated onto an image-receiving surface, and is stored in a memory, are projected to a device exterior by a projecting device. A portable radiation image converting device at which confirmation of a stored radiation image is easy to carry out is thereby provided.