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We report the discovery of highly reddening and hydrogen Balmer andmetastable helium broad absorption lines in the quasar SDSSJ145057.28+530007.6, based on the optical and near-infrared spectra taken fromthe SDSS-III/BOSS and the TripleSpec observations. The nuclear continuum,Balmer decrement and absorption-line depth analyses suggest that (1) theaccretion disk is completely obscured and the covering factor of the broad-lineregion (BLR) is only $0.39\pm0.03$, (2) the power-law continuum is reddened bythe SMC extinction law of $E(B-V )=0.72\pm 0.01$ mag and the dusty materialsare mainly associated with \ion{Ca}{2} H and K rather than the Balmer and\ion{He}{1}* absorption-line system, (3) the unsaturated Balmer (H$\beta$,H$\gamma$, and H$\delta$) and \ion{He}{1}* $\lambda3889$ absorption lines havesame two-Gaussian profiles with the shifts of $-931\pm33$ and $-499\pm39$ kms$^{-1}$ and the widths of $121\pm28$ and $196\pm37$ km s$^{-1}$, respectively.Constrained mutually by the Balmer, \ion{He}{1}* absorption lines andundetected \ion{Fe}{2}* $\lambda5169$ in the photoionization simulations, thephysical properties of the outflow gases are derived as follows: ionizationparameter $10^{-1.4} \lesssim U \lesssim 10^{-0.8}$, density $10^{8.2\pm0.4}\lesssim n_{\rm H} \lesssim 10^{9.0\pm0.4}$ cm$^{-3}$, and column density$10^{22.0\pm0.2} \lesssim N_{\rm H} \lesssim 10^{22.2-22.3}$ cm$^{-2}$. Wepropose that the ultra-dense outflow gases appear in the vicinity of thesurface of the BLR or are located at most 3.12 pc away from the engine. Thatprobably implies that the outflow originates from the BLR, and this kind ofultra-dense BLR scale outflow gases can effectively test the physicalproperties of the outer gases of the BLR.

Ultra-dense Broad-line Region Scale Outflow in Highly Reddened Quasar SDSS J145057.28+530007.6