PURPOSE: To obtain sirocco fan provided with an easy-assemble, great-output, and high-efficient motor with the system in which one bracket is formed the side plate of casing and a structurally reasonable and outwardly less projected motor is provided.

CONSTITUTION: The casing 2 with the suction hole 1 at its central part is provided with the side plate 3 and the one bracket 5 of the motor 4 provided extendedly into the casing 2 is formed at the central part of the side plate 3. The bracket 5 is provided with the bearing 6 on which the shaft 8 of the rotor 7 is supported and the other end of the shaft 8 is supported by the bearing 10 formed to the other bracket 9 facing the bracket 5. And, the extended portion into the casing 2 of the shaft 8 is fitted with the supporting arm 14 bent suffiently to cover the bracket 5 and the peripheral end of the supporting arm 14 is also fitted with a number of the blades 15. Furthermore, the exhaust port 16 is formed at the upper part of the casing 2.