  We examine the lepton-flavor violation caused by a Yukawa coupling matrix
$y_{\nu,ij}$ for right-handed neutrinos in the supersymmetric standard model.
We stress that decay rates for $\tau\rightarrow\mu\gamma$ and $\mu\rightarrow
e\gamma$ may reach the range to be accessible to near future experiments if
left-right mixing terms in the slepton mass matrix are substantially large.
