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We discuss the properties of galaxies around the radio galaxy 3C 324 at z=1.2based on BVRIK' multi-band imaging data. We have applied a photometric-redshifttechnique to objects in the 3C 324 field, and identified 35 objects asplausible cluster members. We have found that red and luminous members areconcentrated in a small region enclosed by a circle of 40" radius (0.33 Mpc atz=1.2 for \Omega_0=0.3, \lambda_0=0.7, H_0=70km/s/Mpc cosmology) from the 3C324 galaxy. The 3C 324 cluster is probably much more compact in size comparedwith the local clusters. We constructed a K'-band luminosity function of thecluster members and fit a Schechter function, and found the characteristicmagnitude to be K*_{AB}=20.2+-0.6. This value is consistent with theextrapolation of the pure passive evolution seen for z<1 clusters. We haveidentified eight bright galaxies which form a red color-magnitude sequence. Theslope of the sequence is consistent with the passive evolution model down toK'_{AB}<22; we also found that there is no clear age variation in these brightred galaxies. However, seven out of these eight galaxies exhibit a significantexcess in the rest UV light with respect to the passive evolution model. Thismay suggest that the massive early-type galaxies in this high-redshift clusterare still forming stars to some extent. We have confirmed a truncation of thecolor-magnitude sequence at K'_{AB}\sim22; faint passively-evolving galaxiesmay not yet be present in this cluster at z\sim1.2. The overall colordistribution of the cluster members, selected by the photometric redshifttechnique, is found to be very broad. We derived the fraction of blue galaxiesin this cluster following aComment: 16 pages, 14 figures, PASJ accepte

Galaxy Population in a Cluster of Galaxies around the Radio Galaxy 3C 324 at $z=1.2$