The present invention relates to a seat belt made of polyester fiber. More particularly, the present invention relates to a polyester seat belt comprising polyester fiber having a tensile strength of 8.0 g/d to 10.0 g/d, and an elongation of 14% to 30%, the polyester seat belt having a tensile strength of 2,800 kgf or higher and an elongation of 11% to 25%. The seat belt of the present invention has excellent mechanical physical properties and high elongation, and therefore, may support a passenger with sufficient strength and exhibit superior shock absorbing properties when the seat belt is arranged in the vehicle back seat or the like.
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