A polylactic acid resin fiber is obtained by melt-spinning a mixture containing 100 parts by weight of a poly-L-lactic acid (A) having an L-lactic acid purity of 99 mol percent or more, 3 to 10 parts by weight of a plasticizer (B), and 0.3 to 1.0 parts by weight of a lubricant (C), wherein the following conditions (a) and (b) are satisfied: (a) the stretch recovery rate is 5 percent or less; and (b) the degree of crystallinity measured by a differential scanning calorimeter is 50 to 70 percent.