Insert and cutting tool including same

An insert, comprising a base which is a cermet comprising hard particles and a binder phase, wherein

• the base comprises
• a first surface,
• a second surface,
• a cutting edge located on at least a part of a ridge line of the first surface and the second surface,
• a third surface located opposite to the first surface, and
• a through hole from the first surface to the third surface,
• an inner wall constituting the through hole comprises a binder-phase-riched layer having a higher content of the binder phase than an inside of the base, at least in a center part,
• a thickness T1 of the binder-phase-riched layer in the center part is larger than a thickness T2 of the binder-phase-riched layer in an end part of the inner wall, and
• the thickness T2 is 0.2 μm or more, and 6 μm or less.

An insert, comprising a base which is a cermet comprising hard particles and a binder phase, wherein

• the base comprises
• a first surface,
• a second surface,
• a cutting edge located on at least a part of a ridge line of the first surface and the second surface,
• a third surface located opposite to the first surface, and
• a through hole from the first surface to the third surface,
• an inner wall constituting the through hole comprises a binder-phase-riched layer having a higher content of the binder phase than an inside of the base, at least in a center part,
• a thickness T1 of the binder-phase-riched layer in the center part is larger than a thickness T2 of the binder-phase-riched layer in an end part of the inner wall, and
• a diameter R1 in the center part is larger than a diameter R2 in the end part.