Chip antenna and antenna device

An antenna device comprising an antenna main body and a mounting board for mounting said antenna main body;

• said antenna main body comprising a substrate comprising at least one material selected from a dielectric material and a magnetic material, at least one conductor formed at least one of in an interior portion of the substrate and on a surface of said substrate, at least one feeding terminal provided on the surface of said substrate and connected to a first end of said conductor for applying a voltage to said conductor, and at least one free terminal provided on the surface of said substrate and connected to a second end of said conductor;
• wherein at least one capacitor-forming conductor, which is connected to said free terminal of said antenna main body, is provided in an interior portion of the mounting board, the substrate comprising a plurality of layers stacked on top of each other, the stacked layers establishing a direction of stacking the stacked layers normal to surfaces of the stacked layers, the conductor disposed spirally with respect to the substrate such that the conductor has a spiral axis extending perpendicular to the direction normal to the surfaces of the stacked layers.