To lower noise and frame temperature by coupling side plates of suction and discharge sides and an outer peripheral plate to a boss via a plurality of guide blades to be integrally formed.

The radial fan 2 comprises side plates of suction and discharge sides, an outer peripheral plate, a boss and a plurality of guide blades 3. And, a side end part of the peripheral plate of substantially cylindrical state is integrally coupled to the side plate of the suction side, and the side plate of the discharge side is integrally coupled to the boss. Further, the components coupled in this manner are coupled by the plurality of the radially disposed blades 3. The fan 2 is integrally molded by casting resin material, aluminum material, magnesium material or the like. Here, wind fed from the vicinity of a center is passed between the blades 3 and both the side plates, and radially flown by rotation of the fan 2. This wind is brought into contact with the peripheral plate covering substantially in a cylindrical state an outer periphery of the fan 2, bent to be horizontal with an axial direction, and discharged from a discharge port 9.