Si-KILLED STEEL WIRE ROD HAVING EXCELLENT FATIGUE PROPERTIES, AND SPRING USING SAME

This Si-killed steel wire rod has Si-killed steel which contains specific chemical components that contain, as 80% or more of the number of inclusions, specific CaO-Al 2 O 3 -SiO 2 inclusions, wherein the average composition of the MnO-Al 2 O 3 -SiO 2 inclusions that satisfies the following (3A) satisfies the following (3B). (3A) If CaO + Al 2 O 3 + SiO 2 + MgO + MnO serves as the 100% standard, MnO + Al 2 O 3 + SiO 2 > 80%, MnO > CaO. (3B) When CaO + Al 2 O 3 + SiO 2 + MgO + MnO serves as the 100% standard, MnO: 10 to 70%, Al 2 O 3 : 3 to 50%, SiO 2 :20 to 75%.