To reduce the quantity of electromagnetic waves to be absorbed to a human body even in the case of using any radio communication frequency respectively accordance with at least two kinds of radio communication system of different radio communication frequency in portable radio equipment.

In the case of communicating through an antenna element 4 with at least two kinds of radio communication frequencies by equalizing an electric length L2 from one end of a conductive plate 11 to the other end by the at least two kinds of radio communication frequencies by a dielectric 13, an impedance at the open end of the plate 11 is nearly equalized in any radio communication frequency so as to suppress a surface current in order to reduce the quantity of the electromagnetic waves to be absorbed by the human body.