To investigate the characteristics of nitrocarburizing for high carbon chromium bearing steel, it was undertaken 4 hours holding at 850℃ in the atmosphere containing 60% endothermic gas and 40% ammonia. The microstructure of nitrocarburized surface consists of ε-Fe_(2-3)N, γ`-Fe₄N, Fe₃C and Fe₃(C,N), and the ε-nitride was rich in the surface-internal part. The nitrocarburized surface contains a larger volume fraction of primary carbonitrides and has more retained austenite and is slightly harder than the interior.