PURPOSE: To manufacture a roll brush of stable quality continuously and at high efficiency by winding and bonding pile texture on the outer circumference of a paper tube, and heating from inside of the tube.

CONSTITUTION: Hot air sent out from a hot air generator is led to an air feed chamber 31 through an admission port 32 and passes through a hole 44 provided on a base plate 41 of a hot air guide 40 from an air outlet 34. Then, the air is sent out into a paper tube 12 formed by winding paper band soaked with thermosetting resin to spiral form in a roller brush material 16 formed to specified length. The hot air sent out to the roller brush material is guided by a fin 43 wound in spiral form around a prop 42 of the hot air guide and goes upward while whirling in the roller brush material to heat the whole circumference and whole length of the paper tube uniformly. Thus, soaked resin is hardened without giving influences on the pile texture.