Cermet insert and cutting tool provided with cermet insert

A cutting tool, comprising:

• a holder having a length extending from a first end to a second end and comprising a pocket located on a first end side;
• a cermet insert located in the pocket, the cermet insert including a base which is a cermet including a hard particle and a binder phase, wherein
• the cermet insert includes:
• a first surface;
• a second surface;
• a cutting edge located on at least a part of a ridge line between the first surface and the second surface;
• a third surface located opposite to the first surface;
• and
• a through hole extending from the first surface to the third surface,
• an inner wall constituting the through hole comprises, at least in a center portion, a binder-phase-rich layer having a higher binder phase content than an interior of the base,
• a first thickness of the binder-phase-rich layer at the center portion is larger than a second thickness of the binder-phase-rich layer at an end portion of the inner wall,
• the first thickness is 1 μm or more and 20 μm or less,
• the second thickness is 0.2 μm or more and 6 μm or less,
• the first surface comprises a chip breaker, and
• an arithmetic mean roughness of the chip breaker is 0.05 μm or less when a cut-off value is 0.08 mm;
• and
• a clamp inserted into the through hole of the cermet insert.