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We report the discovery of a microlensing exoplanet OGLE-2012-BLG-0563Lb withthe planet-star mass ratio ~1 x 10^{-3}. Intensive photometric observations ofa high-magnification microlensing event allow us to detect a clear signal ofthe planet. Although no parallax signal is detected in the light curve, weinstead succeed at detecting the flux from the host star in high-resolutionJHK'-band images obtained by the Subaru/AO188 and IRCS instruments, allowing usto constrain the absolute physical parameters of the planetary system. With thehelp of a spectroscopic information about the source star obtained during thehigh-magnification state by Bensby et al., we find that the lens system islocated at 1.3^{+0.6}_{-0.8} kpc from us, and consists of an M dwarf(0.34^{+0.12}_{-0.20} M_sun) orbited by a Saturn-mass planet(0.39^{+0.14}_{-0.23} M_Jup) at the projected separation of0.74^{+0.26}_{-0.42} AU (close model) or 4.3^{+1.5}_{-2.5} AU (wide model). Theprobability of contamination in the host star's flux, which would reduce themasses by a factor of up to three, is estimated to be 17%. This possibility canbe tested by future high-resolution imaging. We also estimate the (J-Ks) and(H-Ks) colors of the host star, which are marginally consistent with a lowmetallicity mid-to-early M dwarf, although further observations are requiredfor the metallicity to be conclusive. This is the fifth sub-Jupiter-mass(0.2<m_p/M_Jup<1) microlensing planet around an M dwarf with the mass wellconstrained. The relatively rich harvest of sub-Jupiters around M dwarfs iscontrasted with a possible paucity of ~1--2 Jupiter-mass planets around thesame type of star, which can be explained by the planetary formation process inthe core-accretion scheme.

OGLE-2012-BLG-0563Lb: a Saturn-mass Planet around an M Dwarf with the Mass Constrained by Subaru AO imaging