A bloomed fiber material (bloomed tow 11) is manufactured through a process including: spreading a crimped tow 10 in its width direction by a preliminary blooming device 2 performing primary blooming to bloom the tow 10 by a primary blooming device 3 dividing the tow 10 into at least two divided tows 10A and 10B by a dividing device 4 cutting a parting P between the divided tows 10A and 10B by a cutting device 5 and performing secondary blooming to bloom the divided tows 10A and 10B by a secondary blooming device 6.
