An image reading device is configure to generate an initial data name of image data to be transmitted to a plurality of designated external devices. The image reading device transmits a list request, to each of the plurality of external devices, to transmit a list of data names regarding image data stored in respective external devices. It is determined whether the initial data name is included in at least one of the lists. The image reading device changes the initial data name to another data name which is included in none of the lists when it is determined that the initial data name is included in at least one of the lists. Otherwise, the image reading device does not change the initial data name. Thereafter, the image reading device transmits the image data to the first external device and the second external device using the data name determined as above.