It was reported by the present authors that TiC based cermet sintered after nitrification during raising temperature was superior in creep characteristics, in the similar way to commercially available cermet containing TiN. Then, the present work was undertaken to make clear the cutting performance and the grindability by diamond wheel of the nitrified cermet as above. It was found that the nitrified cermet was also superior in those properties to commercial cermet. The reason was in detail discussed.