An antenna device includes a base substrate supported on a base panel, four radiators each include an inner segment located on the base substrate, a middle segment extended from the inner segment, and an outer segment extended from the middle segment, a grounded radiating member is disposed on the bottom surface of the base panel, two feeds disposed on the bottom surface of the base panel and each having a grounded end connected to the grounded radiating member, and two radiating elements disposed on the bottom surface of the base panel, and each having a central portion connected to the feed end of the feed, and two bending sections coupled to the central portion of the radiating element, two outer sections coupled to the bending sections.