A method for producing a three-dimensional molded fiber article, characterized in that the method comprises: (1) a step in which a highly oriented undrawn yarn made of a polyester-based fiber is (a) heat-treated while maintaining a predetermined length of the yarn, or (b) is subjected to a stress-relieving heat treatment; (2) a step in which a resulting processed yarn is subjected to dyeing; and (3) a step in which a resulting dyed yarn is subjected to weaving; and wherein an elongation rate calculated by [(L2-L1) / L1] × 100% is not more than 6%, wherein a length of a boiling water treated yarn obtained by treating the processed yarn after the step ( 1) obtained in boiling water is L1, and a length of a dry heat treated yarn obtained by treating the boiling water treated yarn in dry heat at a temperature of 180 ° C is L2, (4) a A step in which the resultant moldable fabric is subjected to a hot press process using a mold; and wherein the moldable fabric comprises only a dyed yarn having a residual elongation of 80% or more, the remaining elongation using dyed yarn obtained by untangling the moldable fabric is measured according to JIS L1013 (2010).
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