A wire rod comprising, by mass%: C: 0.90% to 1.15%; Si: 0.10% to 0.50%; Mn: 0.10% to 0.80%; Cr: 0.10% to 0.50%; Ni: 0% to 0.50%; Co: 0% to 1.00%; Mo: 0% to 0.20%; B: 0% to 0.0030%; P: limited to 0.020% or less; S: limited to 0.010% or less; and a remainder including of Fe and impurities, wherein, when a radius of the wire rod is assumed to be R, in a structure observed in a central part within (1/5)R from a center of a cross section of the wire rod, an area fraction of pearlite is 90.0% or more, and an area fraction of pro-eutectoid cementite is 1.00% or less, an average thickness of the pro-eutectoid cementite in the central part is 0.25 μm or less, a total length of the pro-eutectoid cementite per unit area in the central part is less than 40.0 mm/mm 2 , a tensile strength of the wire rod satisfies Formula , and a diameter of the wire rod is 3.0 to 5.5 mm, 1000 × C content % + 300 × Cr content % + 70 ≤ TS ≤ 1000 × C content % + 300 × Cr content % + 160 where the total length of the pro-eutectoid cementite per unit area (mm/mm 2 ) is a sum of lengths of pro-eutectoid cementite observed per unit area, TS in Formula represents the tensile strength of the wire rod when a unit of TS is MPa, "C content (%)" in Formula represents an amount of C contained in the wire rod by mass%, and "Cr content (%)" represents an amount of Cr contained in the wire rod by mass%, wherein the TS, the average thickness of the pro-eutectoid cementite, and the total length of the pro-eutectoid cementite per unit area are measured according to the method described in the description. C: 0.90% to 1.15%; Si: 0.10% to 0.50%; Mn: 0.10% to 0.80%; Cr: 0.10% to 0.50%; Ni: 0% to 0.50%; Co: 0% to 1.00%; Mo: 0% to 0.20%; B: 0% to 0.0030%; P: limited to 0.020% or less; S: limited to 0.010% or less; and a remainder including of Fe and impurities, wherein, when a radius of the wire rod is assumed to be R, in a structure observed in a central part within (1/5)R from a center of a cross section of the wire rod, an area fraction of pearlite is 90.0% or more, and an area fraction of pro-eutectoid cementite is 1.00% or less, an average thickness of the pro-eutectoid cementite in the central part is 0.25 μm or less, a total length of the pro-eutectoid cementite per unit area in the central part is less than 40.0 mm/mm 2 , a tensile strength of the wire rod satisfies Formula , and a diameter of the wire rod is 3.0 to 5.5 mm, 1000 × C content % + 300 × Cr content % + 70 ≤ TS ≤ 1000 × C content % + 300 × Cr content % + 160 where the total length of the pro-eutectoid cementite per unit area (mm/mm 2 ) is a sum of lengths of pro-eutectoid cementite observed per unit area, TS in Formula represents the tensile strength of the wire rod when a unit of TS is MPa, "C content (%)" in Formula represents an amount of C contained in the wire rod by mass%, and "Cr content (%)" represents an amount of Cr contained in the wire rod by mass%, wherein the TS, the average thickness of the pro-eutectoid cementite, and the total length of the pro-eutectoid cementite per unit area are measured according to the method described in the description. where the total length of the pro-eutectoid cementite per unit area (mm/mm 2 ) is a sum of lengths of pro-eutectoid cementite observed per unit area, TS in Formula represents the tensile strength of the wire rod when a unit of TS is MPa, "C content (%)" in Formula represents an amount of C contained in the wire rod by mass%, and "Cr content (%)" represents an amount of Cr contained in the wire rod by mass%, wherein the TS, the average thickness of the pro-eutectoid cementite, and the total length of the pro-eutectoid cementite per unit area are measured according to the method described in the description. <EOS>