  We report on the detection of SiO J=2--1 v=1 (86 GHz) maser emission from the
red supergiant IRAS04553--6825 in the LMC. It has thereby become the first
known source of SiO maser emission outside the Milky Way. We used the
Swedish-ESO Submm Telescope at the European Southern Observatory at La Silla.
With the help of good atmospheric conditions, the excellent performance of the
brand new 3~mm SIS receiver, and 26 hours total observing time we reduced the
noise level to only 63~mJy rms. This allowed us to detect the 0.28~Jy maser
peak. Integrating the flux of the maser profile resulted in a 6.9~${\sigma}$
detection. The SiO maser peak was situated 16~km~s$^{-1}$ redward of the center
of the already known, double peaked OH maser emission. We argue that the SiO
maser peak velocity coincides with the stellar velocity, which is supported by
a spectrum of H$\alpha$ that we took four months later. This would mean that
the outflow velocity of the circumstellar matter around IRAS04553--6825 is
v$_{\rm exp} \sim 26$~km~s$^{-1}$, which is typical for galactic red
supergiants, instead of the abnormally low 11~km~s$^{-1}$ inferred from the OH
data alone. The peak intensity of the SiO maser emission is not incompatible
with ranges found in galactic RSGs, but the total integrated photon flux is
lower than expected for this extremely red and luminous supergiant.
