  The results of deep-imaging observations of a candidate of an absorbed QSO at
z=0.653, AX J131831+3341, are presented. AX J131831+3341 was found during the
course of optical follow-up observations of the ASCA Large Sky Survey, and has
an X-ray luminosity of 10^{45} erg s^{-1} (2-10keV), which corresponds to those
of QSOs. Its optical spectrum shows no significant broad H_beta emission line,
suggesting that the object is an absorbed QSO. Deep R and V band images reveal
the presence of a point-like nucleus and an asymmetric extended component. The
nuclear component has a blue color, and the optical magnitude is much fainter
than that expected from the observed X-ray flux for typical type-1 AGNs. These
photometric properties and the presence of broad MgII 2800A emission can be
explained simultaneously if the observed nuclear light is dominated by
scattered nuclear light, though there is a possibility that the nuclear
component is a slightly absorbed nucleus if its intrinsic X-ray to optical flux
ratio is the largest among X-ray selected AGNs. The size of the extended
component, which is thought to be the host galaxy of the QSO, is larger than
those of normal disk galaxies at z=0-0.75, and the absolute magnitude is
similar to those of the brightest host galaxies of QSOs at redshifts smaller
than 0.5. The V-R and R-I colors of the component are consistent with a 1
Gyr-old stellar population model without absorption.
