  We present results from observations of the most famous starburst galaxy M82
with the High-Resolution Camera onboard the Chandra X-Ray Observatory. We found
nine sources in the central 1' x 1' region, but no source was detected at the
galactic center. Comparing the observations on 1999 October 28 and on 2000
January 20, we found four of the nine sources showed significant time
variability. In particular, CXOM82J095550.2+694047, which is 9" away from the
galactic center, showed extremely large time variability. We conclude that this
source is the origin of the hard X-ray time variability of M82 detected with
ASCA. Assuming a spectral shape obtained by the ASCA observation, its
luminosity in the 0.5 -- 10 keV band changed from 1.2E40 erg/s on 1999 October
28 to 8.7E40 erg/s on 2000 January 20.
