Patent ID: 8911185

Claim:
A detachable insert type cutting tool comprising: a cutting insert having a cutting edge; and a holder having an insert mounting seat on which the cutting insert is detachably mounted, and an upper jaw section and a lower jaw section for pinching and fixing the cutting insert, wherein the insert mounting seat is provided between the lower surface of the upper jaw section and the upper surface of the lower jaw section, convex curve outer surfaces are formed on one side of the upper and lower jaw sections when viewed from the leading end sides of the upper and lower jaw sections, concave curve inner surfaces are formed on the other side of the upper and lower jaw sections, and the concave curve inner surface of the upper jaw section is disposed at a position retreated further radially outward than an arc surface extending along the concave curve inner surface of the lower jaw section in a state where the cutting insert is fixed to the insert mounting seat.