The invention discloses a fan and a
microwave oven. The fan comprises a hub (22) and multiple blades (22) which are arranged at intervals in the circumferential direction of an outer ring (211) of thehub (21), the blade thickness of the blade-shaped cross section of the blades (22) is gradually reduced from leading edges (223) to tailing edges (224) of the blades, and the blade-shaped cross section is
cut out from a radial concentric circle of the outer ring (211) of the hub (21). Therefore, the fan has large stall margin, even if the incoming flow of the inlet blast capacity is
high incidence, the separation of boundary
layers still cannot occur on the blades, thus generation of stall is avoided, and normal work can still be conducted. Meanwhile, the fan has higher adaptability to the inlet incoming flow, the aerodynamic performance of the fan is better, the blast capacity is larger, and the efficiency is higher. Besides, due to the design of sharp angles of trailing edges of the blades, the tails of the blades are a series of fragmentized small vortex structures, the generation of high broad-band
noise is avoided, and thus a certain
noise-reduction effect is achieved.