  We report on the Suzaku results of the mixed-morphology supernova remnant
(SNR) G290.1$-$0.8 (MSH 11-61A). The SNR has an asymmetric structure extended
to the southeast and the northwest. In the X-ray spectra of the center and the
northwest regions, we discover recombining plasma features with the strong Si
Ly$\alpha$ and radiative recombination continuum at $\sim$ 2.7 keV. These
features are the most significant in the northwest region, and the spectra are
well-reproduced with a recombining plasma of $kT_{\rm e} = 0.5$ keV. Whereas
the spectra of other regions are expressed by an ionizing plasma of $kT_{\rm e}
= 0.6$ keV. The recombining plasma has over-solar abundances, while the
ionizing plasma has roughly solar abundances. Hence they are likely ejecta and
interstellar medium (ISM) origin, respectively. The recombining plasma in the
northwest of G290.1$-$0.8 would be generated by a break-out of the supernova
ejecta from a high density circumstellar medium to a low density ISM.
