  When a charged particle encircles around an Alice string, it changes the sign
of the electric charge. In this paper we find a BPS-saturated Alice string in
$U(1)\times SO(3)$ gauge theory with charged complex scalar fields belonging to
the vector representation. After performing BPS completion we solve the BPS
equations numerically. We further embed the Alice string into an ${\cal N}=1$
supersymmetric gauge theory to show that it is half BPS.
