Abstract: A polyamide core-sheath composite fiber includes a sheath polymer formed from polyamide and a core polymer formed from polyether ester amide copolymer, wherein the core-sheath composite fiber has a strength of 3.6 cN/dtex or greater, a cross-sectional uniformity ratio d/R of the core-sheath component in the entire yarn of 0.072 or less, and an electrical specific resistance of 107 to 1010 ?·cm. The polyamide core-sheath composite fiber has a humidity-absorbing property and an antistatic property, and while retaining strength, suppresses generation of fluff and has excellent high-order passability.