A card model radio-communication terminal device comprises a card interface part which is accommodated in a host device to provide a function as a transmitter/receiver terminal for radio communications. An extension housing part is separated from the card interface part and not accommodated in the host device. A card loading part is arranged in the extension housing part to load a card that is capable of being inserted to and removed from the extension housing part, into the card loading part. The card loading part is arranged so that a direction of removal of the card accords with a direction of insertion of the card interface part to the host device, and a card slot of the extension housing part and a housing side wall of the host device are mutually opposed in proximity when the card interface part is inserted in the host device.