An antenna structure is provided. The antenna structure includes a first radiation element, a second radiation element, and a feeding element. The first radiation element includes a first radiation portion, a second radiation portion, and a feeding portion. The second radiation element includes a third radiation portion, a fourth radiation portion, and a grounding portion. The third radiation portion and the first radiation portion are separate from each other and coupled to each other, the third radiation portion and the second radiation portion are separate from each other and coupled to each other, and the fourth radiation portion and the first radiation portion are separate from each other and coupled to each other. The feeding element is electrically connected with the feeding portion and the grounding portion. A junction between the feeding element and the feeding portion is defined as a feeding point.