| 摘要 |
The present invention relates to the cutting insert having a cutting edge which has a corner section that forms a convex arc shape when seen in a planar view from direction facing the rake face and a linear section that is in contact with the corner section at least at one end of the corner section and extends linearly. The cutting edge is provided with a first region along the corner section when seen in a planar a second region along the linear section and a third region between the first region and the second region. A rake angle of the cutting edge in the third region is made greater than rake angles of the cutting edges in the first region and the second region.
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