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.