Drawn polyethylene terephthalate (PET) fiber, and tire-cord comprising the same

The present invention relates to a drawn PET fiber including 90 mol% or more of PET, of which the cross-linking density is 3.0E+22 to 8.0E+22 ea/cm 3 after heat-treating the same at 230°C for 1 minute in a taut state under the initial load of 0.02 g/d, to a PET tire cord, including the drawn fiber and to a pneumatic tire, including the tire cord.