r use in the portable radio communication apparatus shown in FIGS. 9A and 9B; FIG. 10B is a perspective view showing a fitting intrusive circular cylindrical member 505 connected with the hinge portion 503 shown in FIG. 10A and an antenna element 504 connected with the member 505; FIG. 11A is a plan view of a folding portable radio communication apparatus in an open state thereof according to a fo