An antenna device is provided. The antenna device includes a first radiating conductor including a feeding portion and a radiating portion extending from the feeding portion, the feeding portion including a feeding terminal and a shorting pin, a ground electrically connected with the first radiating conductor via the shorting pin and configured to provide a reference potential for the first radiating conductor, and a first switch circuit provided on a side of the radiating portion and configured to selectively connect the radiating portion with the ground. The first radiating conductor is configured to form at least part of an inverted-F antenna structure when the first switch circuit is open and to form at least part of a loop antenna structure when the first switch circuit is closed.