The present disclosure provides an antenna device. The antenna device includes a metal back plate, a metal frame surrounding a periphery of the metal back plate and is connected with the metal back plate, and a radiator configured to receive and radiate electromagnetic waves, the metal back plate and the radiator are spaced so as to from a gap, the gap includes a first gap provided along a short axis direction of the metal back plate and a second gap and a third gap which are bended and extend from two ends of the first gap, respectively, a length of the first gap is smaller than a width of the metal back plate along its short axis. The antenna device of the present disclosure has less influence to antenna performance when being hand-held, and the antenna radiating performance is good.