To provide: a fine-denier high strength polyester yarn having excellent breakage preventing performance and lightness, in addition to excellent weather resistance and dimensional stability which are inherent in polyester fiber textile, and capable of being formed as a fabric especially suitable for sport gear using air pressure and requiring lightness such as a paraglider; and a method for manufacturing the same.

Provided is a fine-denier polyester yarn including a polyester fiber having polyethylenenaphthalate as a main repeating unit, the fine-denier polyester yarn satisfying all the following properties: (1) intrinsic viscosity (η)F(dl/g) of 0.50-0.70; (2) total fineness (dtex) of 8-20; (3) single filament fineness (dtex) of 0.5-2.5; (4) strength (cN/dtex) of 6.0 or more; (5) ductility (%) of 15 or more; (6) boiling water shrinkage (%) of 2-5; and (7) entanglement number (point/m) of 10-30.