The present invention relates to a marker DNA polymerase delta 1 (POLD1) for diagnosing sensorineural deafness, and a use thereof. Specifically, the present invention relates to a kit for diagnosing sensorineural deafness comprising a polynucleotide including a continuous nucleotide sequences selected from nucleotide sequences in an exon region of a POLD1 gene or a complementary polynucleotide thereof, in an attempt to detect mutation in the POLD1 gene. The present invention further relates to a diagnostic composition, and a method for detecting mutation in genomic DNA to provide diagnostic information. According to one aspect of the present invention, by using the kit or the composition, it is possible to analyze mutation in the POLD1 gene with high sensitivity and accuracy, thereby enabling efficient diagnosis of sensorineural deafness based on the analyzed outcome.
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