An antenna structure includes a metal housing, a feed portion, and a ground portion. The metal housing includes a front frame, a backboard, and a side frame. The side frame defines a slot and the front frame defines a first gap and a second gap. The metal housing is divided into at least a first radiating portion and a second radiating portion by the slot and the first and second gaps. The feed portion is electrically connected to the first radiating portion. The ground portion is electrically connected to the first radiating portion. The second radiating portion includes a first radiating section, a second radiating section, and a connecting section perpendicularly connected to the first radiating section, the second radiating section, and the backboard. The first radiating section and the second radiating section are both parallel to the first radiating portion.