CUTTING INSERT AND REPLACEABLE-BLADE-TYPE CUTTING TOOL

A minor cutting edge 15 has a first minor cutting edge 31 and a second minor cutting edge 32 that extends inward of the insert in a direction of an insert short side face axial line C3, as the second minor cutting edge 32 extends from the first minor cutting edge 31 in a direction of an insert major face axial line C1. A flank face 42 of the second minor cutting edge 32 is inclined outward of the insert in the direction of the insert short side face axial line C3, as the flank face 42 extends from the second minor cutting edge 32 in the direction of an insert long side face axial line C2, and is inclined outward of the insert in the direction of the insert short side face axial line C3, as the flank face 42 extends from a major face 11 adjacent to the flank face 42 in the direction of the insert major face axial line C1. A length of a flank face 41 of the first minor cutting edge 31 is shortened in the direction of the insert major face axial line C1, as the flank face 41 extends from the first minor cutting edge 31 in the direction of the insert long side face axial line C2. The flank faces 41 of a pair of the first minor cutting edges 31 of a short side face 13 are formed in mutually different planes.