A cermet insert excelling in chipping resistance and abrasion resistance; and a relevant cutting tool. There is provided a cermet insert having a structure composed of a hard phase and a binding phase and, as a sintered body composition, containing Ti and Nb and/or Ta and W in a sum of value of Ti in terms of carbonitride, value of Nb and/or Ta in terms of carbide and value of W in terms of carbide of 70 to 95 wt.% based on the entirety of the structure and containing W in a value in terms of carbide of 15 to 35 wt.% together with Co and/or Ni. The hard phase has one or two or more of the phases: (1) first hard phase of core-having structure whose core portion contains a titanium carbonitride phase and whose surrounding portion contains a (Ti, W, Ta/Nb)CN phase, (2) second hard phase of core-having structure whose core portion and surrounding portion simultaneously contain a (Ti, W, Ta/Nb)CN phase, and (3) third hard phase of single-phase structure consisting of a titanium cabonitride phase. Moreover, in the titanium carbonitride phase, a W-rich phase is unevenly distributed.