A polyvinyl chloride-based fiber of the present invention is a fiber
formed with a vinyl chloride resin composition that comprises (a) 100
parts by weight of vinyl chloride resin, and (b) 0.2 to 20 parts by
weight of crosslinked vinyl chloride resin in which a weight fraction of
constituents that are insoluble in tetrahydrofuran is 18 to 45% and a
viscosity average degree of polymerization of constituents that are
soluble in tetrahydrofuran is 500 to 1800, in which a cross-sectional
shape of the fiber comprises a combination of at least two of circles,
ellipses, and parabolas. When this fiber is used as artificial hair, it
is possible to provide style changeability without impairing matte
properties and touch of the vinyl chloride-based fiber. Furthermore, the
fiber of the present invention can be produced stably by melt-spinning,
and thus an industrial advantage also is provided.