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Near-infrared spectra of 15 high-redshift radio galaxies (HzRGs) located at$2<z<2.6$ were obtained by the OH Airglow Suppressor spectrograph mounted onthe Subaru telescope. The UV-optical line ratio diagnostic diagrams indicatethat half of the observed HzRGs have extended emission-line regions with lowmetal abundance, photoionized by a flat-continuum active galactic nucleus suchas a quasar. We also found two probable correlations between radio andrest-optical parameters: (1) HzRGs with massive hosts tend to have a redderrest-optical continuum, and (2) HzRGs with smaller radio sizes also show aredder optical continuum. On the basis of the correlations, the nature of HzRGsat $2<z<2.6$ is discussed.Comment: 23 pages, 7 figures, Corrected typos and style. Accepted for  publication in ApJ (November 20, 2003

Infrared Spectroscopy of 15 Radio Galaxies at [FORMULA][F]2<z<2.6[/F][/FORMULA]