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We present the first determination of the abundance ratios of $^{13}$Csubstitutions of cyanoacetylene (HC$_{3}$N),[H$^{13}$CCCN]:[HC$^{13}$CCN]:[HCC$^{13}$CN] in Titan's atmosphere measuredusing millimeter-wave spectra obtained by the Atacama LargeMillimeter-submillimeter Array. To compare the line intensities precisely,datasets which include multiple molecular lines were extracted to suppresseffects of Titan's environmental conditions and observation settings. The[HC$^{13}$CCN]:[HCC$^{13}$CN] and [H$^{13}$CCCN]:[HCC$^{13}$CN}] ratios wereobtained from 12 and 1 selected datasets, respectively. As a result, nearly theuniform [H$^{13}$CCCN]:[HC$^{13}$CCN]:[HCC$^{13}$CN] abundance ratios as 1.17($\pm$0.20) : 1.09 ($\pm$0.25) : 1 (1$\sigma$) were derived, whereas previouslyreported ratios for interstellar medium (ISM) have shown large anomalies thatmay be caused by $^{13}$C concentrations in precursors. The result obtainedhere suggests that $^{13}$C concentration processes suggested in the ISMstudies do not work effectively on precursors of HC$_{3}$N and HC$_{3}$N itselfdue to Titan's high atmospheric temperature and/or depletion of both $^{13}$Cand $^{13}$C$^+$.

$^{13}$C isotopic ratios of HC$_3$N on Titan measured with ALMA