A high speed tool steel containing, by mass percent, 0.5-1.5% of C; 1.0% or less of Si; 1.0% or less of Mn; 3.0-5.0% of Cr; 15.0-25.0% of one or two kinds of W and Mo according to a formula (W+2Mo); 1.0-less than 1.5% of V; 5.0-10.0% of Co; and a remainder including Fe and impurities, the high speed tool steel further containing 0.0005-0.004% of Ca and 0.005-0.015% of N. Also, a material for a blade edge that is made of the high speed tool steel and a cutting tool made by welding the material for the blade edge to a body material. Further, a manufacturing method of the material for the blade edge.