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I present the discovery of Balmer-line absorption from H alpha to H9 in ironlow-ionizaton broad absorption line (FeLoBAL) quasar, SDSS~J172341.10+555340.5by near-infrared spectroscopy with the Cooled Infrared Spectrograph and Camerafor OHS (CISCO) attached to the Subaru telescope. The redshift of theBalmer-line absorption troughs is 2.0530 +/- 0.0003, and it is blueshifted by5370 km s^{-1} from the Balmer emission lines. It is more than $4000$ km s^{-1}blueshifted from the previously known UV absorption lines. I detect relativelystrong (EW_rest=20A) [O III] emission lines which are similar to those found inother broad absorption line quasars with Balmer-line absorption. I derived acolumn density of neutral hydrogen of 5.2x10^{17} cm^{-2} by using the curve ofgrowth and taking account of Ly alpha trapping. I searched for UV absorptionlines which have the same redshift with Balmer-line absorption. I found Al II}and Fe III absorption lines at z=2.053 which correspond to previouslyunidentified absorption lines, and the presence of other blended troughs thatwere difficult to identify.

Broad Balmer-line Absorption in SDSS J172341.10+555340.5