A cutting insert, comprising:
- an upper surface comprising a first corner and a first side extended from the first corner;
- a lower surface located on a side opposite to the upper surface;
- a lateral surface located between the upper surface and the lower surface;
- and
- a cutting edge located on an intersection of the upper surface and the lateral surface,
- the upper surface further comprising
- a rake surface located along the cutting edge and becoming closer to the lower surface as the rake surface going away from the cutting edge,
- a bottom surface located along the rake surface further inwardly than the rake surface, and
- a raised surface located along the bottom surface further inwardly than the bottom surface, the raised surface being a continuously inclined surface that becomes further away from the lower surface as the raised surface going away from the bottom surface,
- the bottom surface comprising
- a first bottom surface located on a bisector of the first corner in a plan view of the upper surface,
- a second bottom surface located inwardly of the first side, and
- a third bottom surface located inwardly of the first side and located further away from the first bottom surface than the second bottom surface,
- wherein
- the first bottom surface becomes closer to the lower surface as the first bottom surface going away from the first corner,
- an inclination angle of the first bottom surface relative to the lower surface is smaller than an inclination angle of the rake surface relative to the lower surface,
- the second bottom surface is a continuously inclined surface that becomes further away from the lower surface as the second bottom surface going away from the first side,
- the raised surface is located along the first bottom surface and the second bottom surface,
- an inclination angle of the second bottom surface relative to the lower surface is smaller than an inclination angle of the raised surface relative to the lower surface,
- the third bottom surface becomes further away from the lower surface as the third bottom surface going away from the first side,
- an inclination angle of the third bottom surface relative to the lower surface is smaller than the inclination angle of the second bottom surface relative to the lower surface in a cross section orthogonal to the first side in the plan view of the upper surface and orthogonal to the lower surface,
- the third bottom surface comprises, in the plan view of the upper surface,
- a first region whose width in a direction orthogonal to the first side becomes larger as the first region of the third bottom surface going away from the first bottom surface, and
- a second region located, further away from the second bottom surface than the first region, and a width of the second region in the direction orthogonal to the first side becomes smaller as the second region of the third bottom surface going away from the first bottom surface,
- the raised surface comprises
- a first raised surface which is located inwardly of the first side, a height of the first raised surface increasing as the first raised surface going away from the first corner, and
- a second raised surface which is located inwardly of the first side and located further away from the first corner than the first raised surface, a height of the second raised surface decreasing as the second raised surface going away from the first corner, and
- the first region is located closer to the first corner than a boundary between the first raised surface and the second raised surface.