A mobile terminal device includes a movable side housing, a fixed side housing connected to the movable side housing with a hinge part and a thin-wire cable as an electrical current flow passage electrically connected between the movable side housing and the fixed side housing. A cable mount cover member protects the thin-wire coaxial cable. The thin-wire coaxial cable has a cable main body having plural thin wires embedded therein and a cable connector connected to the cable main body, and the cable mount cover has a cable enclosure member enclosing the cable main body and a connector enclosure member enclosing surrounding of the cable connector.