  We report the result of $D^0$ and $D^+$ lifetime measurement using $D^0\to
K^-\pi^+$ and $D^+\to K^-\pi^+\pi^+$ decays reconstructed using $72~{\rm
fb^{-1}}$ of data collected by the Belle II experiment at SuperKEKB
asymmetric-energy $e^{+}e^{-}$ collider. The results,
$\tau(D^0)=410.5\pm1.1({\rm stat})\pm0.8({\rm syst})~{\rm fs}$ and
$\tau(D^+)=1030.4\pm4.7({\rm stat})\pm 3.1({\rm syst})~{\rm fs}$, are the most
precise to date and are consistent with previous measurements.
