A filament nonwoven fabric which is composed of a hollow fiber having excellent strength, especially a hollow fiber having high single fiber strength which has high hollow rate even when formed into a thin fiber. Specifically disclosed is a filament nonwoven fabric composed of a hollow fiber of a propylene polymer which has a ratio of the Z average molecular weight (Mz) to the weight average molecular weight (Mw), (Mz/Mw) of 1.5-1.9, preferably with the ratio of the weight average molecular weight (Mw) to the number average molecular weight (Mn), (Mw/Mn) being within the range of 2.0-2.9.
