Carburized component and method for manufacturing same

A carburized part which is formed by processing a steel into a shape of a part and performing a carburizing treatment on the steel, the steel having a composition consisting essentially of, in terms of % by mass:

• 0.10% to 0.40% of C;
• 0.05% to 2.00% of Si;
• 0.30% to 2.00% of Mn;
• 0.30% to 3.00% of Cr;
• 0.025% or less of N;
• 0 to 0.80% of Mo, and
• as a pinning particle forming element which forms a pinning particle by nitrification, one or two or more elements selected from:
• 0.020% to 0.100% of Al;
• 0.01% to 0.20% of Nb;
• and
• 0.005% to 0.20% of Ti,
• with the remainder being Fe and inevitable impurities,
• wherein a crystal grain size number of a surface layer of the part at a depth of 50 μm or less from a surface is greater than 5, and the crystal grain size number of an inner portion of the part at a depth of 3 mm or more from the surface is 5 or less,
• wherein an N concentration in the surface layer of the part is higher than the N concentration in the inner portion of the part, and
• wherein nitrides of one or two or more elements selected from Al, Nb, or Ti are precipitated in the surface layer of the part at a depth of 50 μm or less from the surface.