A mobile radio apparatus of the present invention includes an apparatus body having a connector portion at one side thereof. A main display is mounted on the apparatus body. An auxiliary display includes a terminal portion and is removably connected to the side of the apparatus body with the terminal portion mating with the connector portion of the apparatus body. The auxiliary display connected to the apparatus body assists the main display in displaying data at the time of, e.g., transmission or receipt. When the apparatus is carried by the user, the auxiliary display is dismounted from the apparatus body. The apparatus therefore achieves a great display capacity without being increased in size.