A nitrided plate part having a sheared end face, a sheet-thickness central portion in a portion at least 5 mm or more away from the sheared end face having a chemical composition consisting of, in mass%, C: equal to or greater than 0.025% and equal to or less than 0.113%, Si: 0.10% or less, Mn: equal to or greater than 0.71% and equal to or less than 1.49%, P: 0.020% or less, S: 0.0200% or less, Ti: equal to or greater than 0.020% and equal to or less than 0.091%, Cr: equal to or greater than 0.130% and equal to or less than 0.340%, Al: equal to or greater than 0.10% and equal to or less than 0.35%, N: equal to or greater than 0.0007% and equal to or less than 0.0300%, Nb: equal to or greater than 0% and equal to or less than 0.020%, Mo: equal to or greater than 0% and equal to or less than 0.140%, V: equal to or greater than 0% and equal to or less than 0.100%, B: equal to or greater than 0% and equal to or less than 0.0030%, Cu: equal to or greater than 0% and equal to or less than 0.13%, Ni: equal to or greater than 0% and less than 0.08%, W: equal to or greater than 0% and equal to or less than 0.07%, Co: equal to or greater than 0% and equal to or less than 0.07%, Ca: equal to or greater than 0% and less than 0.007%, Mg: equal to or greater than 0% and less than 0.005%, REM: equal to or greater than 0% and less than 0.005%, and the balance: Fe and impurities, wherein nitrogen average content in a range in which a distance from the sheared end face in a sheared end face normal direction is equal to or greater than 0.05 mm and equal to or less than 0.10 mm is equal to or greater than 0.4000% and equal to or less than 1.2000% in mass%, and minimum nitrogen content in a range in which the distance is equal to or greater than 0.015 mm and equal to or less than 0.200 mm is 0.0600% or more, and an area ratio of ferrite structure in a metal structure is 70% or less, wherein the nitrogen average content and the minimum nitrogen content are measured at intervals of equal to or greater than 0.001 mm and equal to or less than 0.005 mm, along a line in a range within ±0.1 mm from the sheet-thickness center, and the nitrogen average content and the minimum nitrogen content are measured at at least three spots or more. C: equal to or greater than 0.025% and equal to or less than 0.113%, Si: 0.10% or less, Mn: equal to or greater than 0.71% and equal to or less than 1.49%, P: 0.020% or less, S: 0.0200% or less, Ti: equal to or greater than 0.020% and equal to or less than 0.091%, Cr: equal to or greater than 0.130% and equal to or less than 0.340%, Al: equal to or greater than 0.10% and equal to or less than 0.35%, N: equal to or greater than 0.0007% and equal to or less than 0.0300%, Nb: equal to or greater than 0% and equal to or less than 0.020%, Mo: equal to or greater than 0% and equal to or less than 0.140%, V: equal to or greater than 0% and equal to or less than 0.100%, B: equal to or greater than 0% and equal to or less than 0.0030%, Cu: equal to or greater than 0% and equal to or less than 0.13%, Ni: equal to or greater than 0% and less than 0.08%, W: equal to or greater than 0% and equal to or less than 0.07%, Co: equal to or greater than 0% and equal to or less than 0.07%, Ca: equal to or greater than 0% and less than 0.007%, Mg: equal to or greater than 0% and less than 0.005%, REM: equal to or greater than 0% and less than 0.005%, and the balance: Fe and impurities, wherein nitrogen average content in a range in which a distance from the sheared end face in a sheared end face normal direction is equal to or greater than 0.05 mm and equal to or less than 0.10 mm is equal to or greater than 0.4000% and equal to or less than 1.2000% in mass%, and minimum nitrogen content in a range in which the distance is equal to or greater than 0.015 mm and equal to or less than 0.200 mm is 0.0600% or more, and an area ratio of ferrite structure in a metal structure is 70% or less, wherein the nitrogen average content and the minimum nitrogen content are measured at intervals of equal to or greater than 0.001 mm and equal to or less than 0.005 mm, along a line in a range within ±0.1 mm from the sheet-thickness center, and the nitrogen average content and the minimum nitrogen content are measured at at least three spots or more.