PURPOSE: To manufacture a reinforced hose in a short period of time by extruding a covering material out of an introducing hole of an extruder, covering and forming an inner tube on the outer periphery of a core rod and removing the core rod out of the inner tube after forming a reinforcing yarn layer and an outer tube on the outer periphery of the inner tube.

CONSTITUTION: A plurality of core rods 5 cut into a given length are introduced into an extruder 9 continuously in a state that each end face are brought into contact with each other. While delivering out the core rod 5 to the front of a nozzle 30 of the extruder 9 at a constant speed, an inner tube 2 is formed to cover the outer periphery of the core rod 5 by extruding a covering material from an introducing hole 25 of the extruder 9. Next, when the rear end of the core 5 is positioned at position L between the end of the nozzle 30 and an outlet of a die 35, the core rod 5 is pulled forward. By said arrangement, the core rod 5 and the inner tube 2 covering the core rod are pulled and separated out from the following core rod 5. Then, a reinforcing yarn layer 3 and an outer tube 4 are formed on the outer periphery of the inner tube 2. Lastly, the core rod 5 is taken out of the inner tube 2.