A meander line antenna formed by folding a conductive pattern of a folded dipole antenna in the shape of a meander is disclosed. The basic structure of the meander line antenna includes a bottom halfsection formed by a folded conductive pattern, and a feeding point (c) arranged approximately at the center of the folded conductive pattern for mounting an IC chip, a top half section consisting of afolded conductive pattern shaped like the bottom half section, a coarse tuning section (a) consisting of two or more short circuit conductive patterns 1 for coarse tuning that connects countering conductive patterns of either or both of the bottom half section and the top half section at a predetermined interval, and a fine-tuning section (b) consisting of two or more short circuit conductive patterns 2 for fine tuning that connect countering conductive patterns of the top half section, the countering conductive patterns being located at a position that counters the feeding point (c), at a predetermined interval.