A fan structure includes a fan frame and a fan body. The fan frame includes two side plates, a first connecting plate, a buckling portion and a second connecting plate. The side plate includes a fan stopping plate, a first protruding portion and two second protruding portions. The first protruding portion and the second protruding portions are disposed on the fan stopping plate. The first connecting plate is connected with the fan stopping plates. The buckling portion is disposed on the first connecting plate. The second connecting plate connects with the fan stopping plates and the first connecting plate. The fan body is accommodated between the side plates. The fan body has some first and second recessed portions which accommodate the first protruding portions and the second protruding portions respectively. The side plates, the first connecting plate and the second connecting plate are integrally formed.