PURPOSE: To prevent sticking of short fibers to the inner wall surface, by increasing the temperature of the inner surface of a fiber collecting part hood in a fiber production apparatus for blowing a high-speed air stream on a heat softening material to be fiberized to fly the material, fiberizing the material and collecting the resultant fibers.

CONSTITUTION: Raw material glass is fed from a glass raw material storehouse 1 to a melting tank 2 and melted and the resultant molten glass 3 is then fed to a fiberizing means 4. A high-speed air stream is blown thereon to fly the glass 3 in a hood 5 and a binder solution is sprayed from nozzles 6 and deposited on the fibers. The resultant short fibers 7 are collected in a fiber collecting device, e.g. conveyor net 8, etc. In the process, a fluid passage is formed in the interior of the hood 5 and a heating fluid, e.g. heating air or steam, is fed to the fluid passage to increase the temperature of the inner wall surface of the hood 5 or a resistance heating heater, etc., is provided to increase the temperature of the inner wall surface of the hood 5. Thereby, sticking of the short fibers 7 to the inner wall surface of the hood 5 is prevented.