Cutting insert, cutting tool, and method of producing machined product using the same

A cutting insert comprising:

• a first corner;
• a first region located along the first corner;
• a second region located more inward than the first region and inclined to the first region;
• a boundary of the first region and the second region that includes a first part located on a bisector of the first corner and second parts located at both sides of the first part in a top view;
• and
• a second corner adjacent to the first corner,
• wherein an interior angle of the second corner is larger than an interior angle of the first corner in the top view and the second parts are higher than the first part.

A cutting insert, comprising:

• a first surface that includes:
• a first corner;
• a first region located along the first corner;
• a second region located more inward than the first region and inclined to the first region;
• and
• a boundary of the first region and the second region that includes a first part located on a bisector of the first corner and second parts located at both sides of the first part;
• a second surface located opposite to the first surface;
• a central axis passing through a center of the first surface and the second surface;
• and
• an imaginary plane perpendicular to the central axis and located closer to the second surface than the first surface,
• wherein the first part of the boundary is closer to the imaginary plane than both of the second parts of the boundary.