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The lifetimes of charmed mesons have been measured using 11.1fb$^{-1} of datacollected with the Belle detector at KEKB. Each candidate is fullyreconstructed to identify the flavor of the charmed meson. The lifetimes aremeasured to be $\tau(D^0)=(414.5\pm1.7)$ fs, $\tau(D^+)=(1029\pm12)$ fs and$\tau(D_s^+)=(488.4^{+7.8}_{-7.7})$ fs, where the error is statistical only.The mixing parameter $y_{CP}$ is also measured to be$y_{CP}=(1.16^{+1.67}_{-1.65}(stat.))%$ through the lifetime difference of$D^0$ mesons decaying into CP-mixed states and CP eigenstates.Comment: 4 pages, 10 figures, BCP4, Ise-Shima, Japan, 19-23 February 200

MEASUREMENTS OF CHARMED MESON LIFETIMES AND SEARCH FOR ${D^0} - {\overline D ^0}$ MIXING WITH THE BELLE EXPERIMENT