Cermet insert and cutting tool

A cermet insert comprising:

• a microstructure including a hard phase and a binding phase;
• Ti, Nb and/or Ta, and W such that a sum of a converted amount of Ti converted into carbonitride, a converted amount of Nb and/or Ta converted into carbide, and a converted amount of W converted into carbide is 70-95 mass % of an entirety of the microstructure, and in which the converted amount of W converted into carbide is 15-35 mass % of the entirety of the microstructure;
• and
• Co and/or Ni as the sintered body composition,
• wherein the hard phase comprises one kind or two or more kinds of phases selected from (1)-(3) except for a singularity of (2), in which
• (1) a first hard phase is provided with a core-having structure in which a core portion includes a titanium carbonitride phase, and a peripheral portion includes a complex carbonitride phase comprising Ti, W, Ta and/or Nb (to be referred to (Ti, W, Ta/Nb)CN phase hereinafter),
• (2) a second hard phase is provided with a core-having structure in which both of a core portion and a peripheral portion include a (Ti, W, Ta/Nb)CN phase;
• and
• (3) a third hard phase is provided with a single-phase structure comprising a titanium carbonitride phase, and
• wherein the titanium carbonitride phase includes W-rich phases, which are rich in W as compared to a surrounding thereof, and unevenly distributed in the titanium carbonitride phase.