A nitrided component has a chemical composition consisting of, by mass percent, C: 0.07-0.14%, Si: 0.10-0.30%, Mn: 0.4-1.0%, S: 0.005-0.030%, Cr: 1.0-1.5%, Mo: ≤0.05% (including 0%), Al: 0.010% or more to less than 0.10%, V: 0.10-0.25%, optionally at least one element selected from Cu: ≤0.30% and Ni: ≤0.25%, [0.61Mn+1.11Cr+0.35Mo+0.47V≤2.30], and the balance of Fe and impurities. P, N, Ti and O among the impurities are P: ≤0.030%, N: ≤0.008%, Ti: ≤0.005%, and O: ≤0.0030%. The nitrided composition is suitable for use as an automobile ring gear. The nitrided component has a surface hardness of 650-900 HV, core hardness being ≥150 HV, effective case depth of ≥0.15 mm, has excellent bending fatigue strength and surface fatigue strength although the content of Mo is as low as ≤0.05% and has a small amount of expansion caused by nitriding.