Rotary cutting blade material and method for manufacturing the same

A rotary cutting blade material for a rotary cutting blade attached to a shank for use,

• the rotary cutting blade material having an attaching structure forming portion that is to serve as an attaching portion to the shank, a cutting structure forming portion that is to serve as a cutting blade, and a joint portion,
• the cutting structure forming portion having a core portion and a surface portion provided on the attaching structure forming portion with the joint portion being interposed,
• the surface portion covering at least a part of a surface of the core portion,
• the attaching structure forming portion including a hard material including a hard component and one or two or more types of iron group elements, the hard material having a Young's modulus of not more than 350 GPa,
• the core portion including a cemented carbide material,
• the surface portion including PCD (polycrystalline diamond) or CBN (cubic boron nitride),
• the hard component being at least one selected from the group consisting of W (tungsten), WC (tungsten carbide), TiC (titanium carbide), TiCN (titanium carbonitride), Al2O3 (alumina), and a combination of at least one of CBN (cubic boron nitride) and diamond and at least one of W and WC.