  Branching ratio of $\mu \to \e \gamma$ is evaluated in the supersymmetric
SU(5) grand unified theory taking account of higher dimensional operators,
which reproduce the realistic quark and lepton masses and the mixing
parameters. It is shown by numerical calculation that at large $\tan\beta$ the
branching ratio is enhanced by a few orders of magnitude since the flavor
mixings for both the left- and the right-handed sleptons are induced by the
effect of the higher dimensional operators.
