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The archival data of 3C 345, a type 1 quasar at $z = 0.5928$, obtained withSuzaku and Swift/BAT are analysed. Though previous studies of this sourceapplied only a simple broken power law model, a heavily obscuring material isfound to be required by considering Akaike information criteria. Theapplication of the numerical torus model by Murphy & Yaqoob (2009) surprisinglyreveals the existence of Compton thick type 2 nucleus with the line-of-sighthydrogen column density of the torus of $N_{\rm H} = 10^{24.5}$ cm$^{-2}$ andthe inclination angle of $\theta_{\rm inc} = 90^{\circ}$. However, this modelfails to account for the Eddington ratio obtained with the optical observationsby Gu et al. (2001) and Shen et al. (2011), or requires the existence of asupermassive black hole binary, which was suggested by Lobanov & Roland (2005),thus this model is likely to be inappropriate for 3C 345. A partial coveringionized absorber model which accounts for absorption in "hard excess" type 1AGNs is also applied, and finds a Compton thick absorber with the columndensity of $N_{\rm H} \simeq 10^{25}$ cm$^{-2}$, the ionization parameter of$\log \xi \gtrsim 2$, and the covering fraction of $75\% \lesssim f_{c}\lesssim 85\%$. Since this model obtains a black hole mass of $\log ( M_{\rmBH} / M_{\odot} ) = 9.8$, which is consistent with the optical observation byGu et al. (2001), this model is likely to be the best-fitting model of thissource. The results suggest that 3C 345 is the most distant and most obscuredhard excess AGN at this time.

Compton thick absorber in type 1 quasar 3C 345 revealed by Suzaku and Swift/BAT