The antenna device and a wireless communication device

Disclosed is an antenna device, a radiator (40) of which is provided with: looped radiation conductors (1, 2), a capacitor (C1), an inductor (L1), and a power feeding point (P1) provided on the radiation conductor (1). The distance between the radiation conductors (1, 2) and a grounded conductor (G1) gradually increases as the radiation conductours (1,2) going away from the power feeding point (P1) in a portion where the radiation conductors (1, 2) of the radiator (40) and the grounded conductor (G1) are close to each other. When the radiator (40) is excited at a low-pass resonance frequency (f1), an electrical current flows through a pathway that includes the inductor (L1) and the capacitor (C1) and follows the inner periphery of the loops of the radiation conductors. When the radiator (40) is excited at a high-pass resonant frequency (f2), an electrical current flows through a pathway that includes a section where one end is the power feeding point (P1), the section including the capacitor (C1), not including the inductor(L1), and following the outer periphery of the loops of the radiation conductors.