The dielectric antenna device of the present invention is a dielectric
antenna device having at least one feed element that is buried in a
dielectric. The interval between the end portion of the feed element and
the end face of the dielectric in a direction passing through the end
portion of the feed element from a feeding point thereof is substantially
1/20 or more of the wavelength of a wireless signal that is formed within
the dielectric. This constitution provides a dielectric antenna device
that has stabilized resonance frequency.