Cutting insert, cutting tool and method for manufacturing cut product

A cutting insert, comprising:

• a top surface;
• a bottom surface;
• a side surface disposed between the top surface and the bottom surface;
• a cutting edge formed along an edge where the top surface and the side surface meet;
• and
• a through-hole formed from a center portion of the top surface through a center portion of the bottom surface,
• the cutting edge including in an order of an end cutting edge, a first major cutting edge and a second major cutting edge;
• a height of the end cutting edge relative to an imaginary plane orthogonal to a central axis of the through-hole being fixed;
• the first major cutting edge comprising a curved shape that protrudes outwards when viewed from directly above, and a height of the first major cutting edge relative to the imaginary plane increasing, when viewed from a side, moving away from an end of the first major cutting edge connected to the end cutting edge;
• the second major cutting edge comprising a curved shape that protrudes outwards when viewed from directly above, and a height of the second major cutting edge relative to the imaginary plane decreasing, when viewed from a side, moving away from an end of the second major cutting edge connected to the first major cutting edge;
• when viewed from a side, an angle of inclination of the second major cutting edge relative to the imaginary plane being greater at a center of the second major cutting edge than at either end thereof;
• and
• when viewed from a side, an angle of inclination, relative to the imaginary plane, of an imaginary line connecting both ends of the second major cutting edge being greater than an angle of inclination, relative to the imaginary plane, of an imaginary line connecting both ends of the first major cutting edge.