A conductive
metal frame and a first hinge portion fitted onto an upper case are connected electrically, first and second hinge portions are joined to turn on a rotating shaft, and the first and second hinge portions and the rotating shaft are formed of a conductive
metal and conducted electrically via respective contact points. The second hinge portion as the feeding portion is connected to a matching circuit on a circuit board, and one end of a conductive
metal element having a predetermined length is connected to the second hinge portion to have an
electrical conduction thereto and the other end of the conductive metal element is opened. The conductive metal element is arranged in parallel with a direction orthogonal with a longitudinal direction of a lower case, and is arranged near a surface on the opposite side to the surface on which the operation keys are arranged.