| 摘要 |
A cutting insert 1 of one embodiment of the present invention includes an upper surface 2, a side surface 4 having a front clearance surface 4a, and an end cutting edge 5a located along an intersection of the upper surface 2 and the front clearance surface 4a. The upper surface 2 includes an end rake surface 21a that is inclined downward as departing from the end cutting edge 5a, a pair of front protrusions 22a that is located apart from the end cutting edge 5a and are less apart from each other as departing from the end cutting edge 5a, a rear protrusion 22c located further apart from the end cutting edge 5a than the pair of front protrusions 22a, and a pair of intermediate protrusions 22b that is at least partially located between the pair of front protrusions 22a and the rear protrusion 22c. Top portions 22b2 of the pair of intermediate protrusions 22b are respectively located between the pair of front protrusions 22a and the rear protrusion 22c, and are higher than top portions 22a2 of the front protrusions 22a and a top portion 22c2 of the rear protrusion 22c. |
