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We present our first results of the survey for high redshift quasars at $5\lesssim {\rm z} \lesssim 5.7$. The search for quasars in this redshift rangehas been known to be challenging due to limitations of filter sets used inprevious studies. We conducted a quasar survey for two specific redshiftranges, 4.60 $\leq$ z $\leq$ 5.40 and 5.50 $\leq$ z $\leq$ 6.05, usingmulti-wavelength data that include observations using custom-designed filters,$is$ and $iz$. Using these filters and a new selection technique, we were ableto reduce the fraction of interlopers. Through optical spectroscopy, weconfirmed seven quasars at 4.7 $\leq$ z $\leq$ 5.4 with $-27.4 < M_{1450} <-26.4$ which were discovered independently by another group recently. Weestimated black hole masses and Eddington ratios of four of these quasars fromoptical and near-infrared spectra, and found that these quasars are undergoingnearly Eddington-limited accretion which is consistent with the rapid growth ofsupermassive black holes in luminous quasars at z $\sim$ 5.

The Infrared Medium-deep Survey. III. Survey of Luminous Quasars at 4.7 $\leq$ z $\leq$ 5.4