A projector includes a fan, a fan frame, a first casing, a second casing and a projection lens. The fan is sleeved in the fan frame, wherein the fan frame comprises a first fixing portion having a first through hole, and two slits located at two opposite sides of the first fixing portion, an extension direction of the two slits is parallel to an extension direction of the first through hole, and a length of each of the two slits is greater than a depth of the first through hole. The first casing is fixed to the fan frame, wherein a first screw passes through the first through hole and is fixed to the first casing. The second casing is fixed to the first casing. The projection lens is fixed to the second casing.