  The supernova remnant (SNR) N49 in the Large Magellanic Cloud has been
observed with the Advanced CCD Imaging Spectrometer (ACIS) on board the {\it
Chandra X-Ray Observatory}. The superb angular resolution of the {\it
Chandra}/ACIS images resolves a point source, the likely X-ray counterpart of
soft gamma-ray repeater SGR 0526$-$66, and the diffuse filaments and knots
across the SNR. These filamentary features represent the blast wave sweeping
through the ambient interstellar medium and nearby dense molecular clouds. We
detect metal-rich ejecta beyond the main blast wave shock boundary in the
southwest of the SNR, which appear to be explosion fragments or ``bullets''
ejected from the progenitor star. The detection of strong H-like Si line
emission in the eastern side of the SNR requires multi-phase shocks in order to
describe the observed X-ray spectrum, whereas such a multi-phase plasma is not
evident in the western side. This complex spectral structure of N49 suggests
that the postshock regions toward the east of the SNR might have been reheated
by the reverse shock off the dense molecular clouds while the blast wave shock
front has decelerated as it propagates into the dense clouds. The X-ray
spectrum of the detected point-like source is continuum dominated and can be
described with a power law of $\Gamma$ $\sim$ 3. This provides a confirmation
that this point-like X-ray source is the counterpart of SGR 0526$-$66 in the
quiescent state.
