CUTTING INSERT AND CUTTING EDGE-REPLACEABLE ROTARY CUTTING TOOL

摘要

In this present invention, a side surface section (4) is configured from corner surface portions (13) and intermediate portions (14) each of which being arranged between the corner surface portions. Each corner surface portion (13) is provided with: a first corner side surface part (13a) which intersects at an obtuse angle (α) with a reference plane which is parallel to a middle plane M; and a second corner side surface part (13b) which intersects at an acute angle (β). Each intermediate portion (14) is configured from a side surface formed at a right angle with respect to the reference plane parallel to the middle plane (M). Furthermore, a third corner surface part (13c) which intersects at a right angle with the reference plane parallel to the middle plane (M) may be disposed between the first corner side surface part (13a) and the second corner side surface part (13b) of the corner surface portion.