To provide a cutting edge replaceable-type finishing radius end mill which can improve the surface roughness of a workpiece material at the time of copy machining.

In the cutting edge replaceable-type finishing radius end mill 1, the shape of a cutting edge of an insert 3 is formed so as to satisfy the following relationships: 0.31D≤r1≤0.45D, and D≥8 mm, where r1 represents a radius of an external-side arcuate cutting edge, and D represents a tool diameter. Further the radius end mill has the other internal-side arcuate cutting edge which has the same tangent as that of the external-side arcuate cutting edge at a lowermost point of the same, and has a radius r2 extending toward the center of a rotation axis and satisfying the following relationship: r1>r2.