  The heavier chargino decay could yield two charged leptons of different
generations, owing to generation mixing of sneutrinos. We discuss the
possibility of producing $e$ and $\mu$ through this process in near future
collider experiments. The analyses are made systematically in the
supersymmetric extension of the standard model without assuming a specific
scenario for the mixing. Production of the heavier chargino is evaluated in
$e^+e^-$ collisions. In the parameter region consistent with nonobservation of
the radiative $\mu$ decay, sizable parts lead to a detectable branching ratio
for the generation-changing decay of the heavier chargino.
