A wireless communication terminal device has a circuit board with a plurality of electronic components arranged thereon and a conductive shielding case attached to the circuit board so that the shielding case covers the plurality of electronic components. At least one of the electronic components is an antenna. A surface shape of the shielding case is formed in a shape not overlapping the antenna. A non-conductive cover is provided at a position on the circuit board corresponding to an area not overlapping the antenna in the surface shape of the shielding case.