FIG. 11C is a cross-sectional view of the card including its enclosure taken on line 11C-11C of FIG. 11B. [0093] As shown in FIGS. 11B and 11C, the PC card of the eighth embodiment has circuit board 1007 having first antenna element 1001, second antenna element 1002, and ground plane 1008. [0094] Antenna element 1001 has first conductor section 1011 made of such materials as a sheet metal, and sec