A cermet which comprises a plurality of hard phases which contains W and nitrogen, and comprises at least one selected from a carbide, nitride and carbonitride of a metal comprising Ti as a main component, a binder phase comprising an iron group metal as a main component, and an interfacial phase being present between the hard phases, wherein a W amount contained in the whole cermet is 5 to 40% by weight, the interfacial phase comprising a complex carbonitride with a larger W amount than a W amount of the adjacent hard phase, and when a W amount contained in the interfacial phase based on the whole metal element is represented by Wb, atomic %, and a W amount contained in the hard phase based on the whole metal element is represented by Wh, atomic %, then, an atomic ratio of Wb to Wh, Wb/Wh, being 1.7 or more, the hard phase comprises: a core-rim structure carbonitride comprising a titanium carbonitride core portion, and a peripheral portion comprising a complex carbonitride solid solution containing Ti and an element(s) of Group 4, 5 or 6 of the Periodic Table other than Ti, or a core-rim structure carbonitride comprising a core portion which comprises a complex carbonitride solid solution containing Ti and an element(s) of Group 4, 5 or 6 of the Periodic Table other than Ti, and a peripheral portion comprising a complex carbonitride solid solution containing Ti and an element(s) of Group 4, 5 or 6 of the Periodic Table other than Ti. a plurality of hard phases which contains W and nitrogen, and comprises at least one selected from a carbide, nitride and carbonitride of a metal comprising Ti as a main component, a binder phase comprising an iron group metal as a main component, and an interfacial phase being present between the hard phases, wherein a W amount contained in the whole cermet is 5 to 40% by weight, the interfacial phase comprising a complex carbonitride with a larger W amount than a W amount of the adjacent hard phase, and when a W amount contained in the interfacial phase based on the whole metal element is represented by Wb, atomic %, and a W amount contained in the hard phase based on the whole metal element is represented by Wh, atomic %, then, an atomic ratio of Wb to Wh, Wb/Wh, being 1.7 or more, the hard phase comprises: a core-rim structure carbonitride comprising a titanium carbonitride core portion, and a peripheral portion comprising a complex carbonitride solid solution containing Ti and an element(s) of Group 4, 5 or 6 of the Periodic Table other than Ti, or a core-rim structure carbonitride comprising a core portion which comprises a complex carbonitride solid solution containing Ti and an element(s) of Group 4, 5 or 6 of the Periodic Table other than Ti, and a peripheral portion comprising a complex carbonitride solid solution containing Ti and an element(s) of Group 4, 5 or 6 of the Periodic Table other than Ti. a core-rim structure carbonitride comprising a titanium carbonitride core portion, and a peripheral portion comprising a complex carbonitride solid solution containing Ti and an element(s) of Group 4, 5 or 6 of the Periodic Table other than Ti, or a core-rim structure carbonitride comprising a core portion which comprises a complex carbonitride solid solution containing Ti and an element(s) of Group 4, 5 or 6 of the Periodic Table other than Ti, and a peripheral portion comprising a complex carbonitride solid solution containing Ti and an element(s) of Group 4, 5 or 6 of the Periodic Table other than Ti. <EOS>