Abstract: There is provided an antenna device which has an antenna element having a predetermined resonant frequency characteristic; and support means for supporting said antenna element. In the antenna device, the support means has at least three electrical connection holes for providing electrical connection to the antenna element, and one desired electrical connection hole from among the electrical connection holes is connected to a feed point, and one desired electrical connection hole from among the electrical connection holes except the electrical connection hole connected to the feed point being connected to ground so that the antenna element is adjustable in resonant frequency characteristic.

Abstract: There is provided an antenna device which includes: a loop antenna connected at one end to a feed point and connected at the other end to ground, and provided to correspond to a first frequency band; and at least one stub antenna provided in the form of extending a part of the loop antenna and provided to correspond to a second frequency band overlapping with a partial frequency band of the first frequency band to which the loop antenna corresponds.