To provide a manufacturing method of a cemented carbide tool and a cemented carbide blade cutting tool, capable of reducing manufacturing cost compared with conventional manufacturing cost.

This cemented carbide blade grinding tool 50 can efficiently perform grinding work by applying strength/weakness to pressing force to a cemented carbide blade 31 of a grinding wheel part 14 by eccentrically rotating the grinding wheel part 14, and can shorten grinding processing time compared with a conventional cemented carbide blade grinding tool even if an ordinary machining center is used. Since an outer peripheral surface 14B of the grinding wheel part 14 is inclined, a step height surface 32B of a recessed part 32 formed on the cemented carbide blade 31 also inclines, and among the recessed part 32, a corner part 32D between a bottom surface 32C and the step height part 32B can be separated from a side surface 35S of a diamond sintered plate material 35. Thus, the grinding processing time is shortened, and an NG product can be reduced, and the manufacturing cost can be reduced.