Artificial hair is made of flame-retardant polyester-based fiber formed of a composition obtained by melt-kneading 5 parts by weight to 30 parts by weight of a bromine-containing flame retardancy agent (B), 0.5 parts by weight to 10 parts by weight of an antimony compound (C) having an average particle diameter ranging from 1.5 μm to 15 μm, and 0.05 parts by weight to 10 parts by weight of at least one kind of a compound (D) selected from the group consisting of: biscarbodiimide compounds; polycarbodiimide compounds; bisoxazoline compounds; and isocyanate compounds, with respect to 100 parts by weight of polyester (A) made of at least one kind of polyalkylene terephthalate and copolyester that contains polyalkylene terephthalate as a main component. Also provided is a fiber for artificial hairs obtained by adhering to that fiber either a polyorganosiloxane-based fiber treating agent or a fiber treating agent containing a flame-retardant organosilicon compound.