A feed radiation electrode functioning as an antenna is capable of performing radio communication in two different frequency bands, a lower frequency band and a higher frequency band, defined in advance for radio communication. The feed radiation electrode has a loop shape, and a feeding end Q and a feeding-end adjacent portion P are connected with a shortcut path, which is provided by a stub, therebetween. Thus, the feed radiation electrode is capable of performing radio communication in the lower frequency band for radio communication in accordance with a resonant operation based on a current flowing through a channel IL and performing radio communication in the higher frequency band for radio communication in accordance with a resonant operation based on currents flowing through channels IH and IH′.